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  3. More than two-thirds of people who try just one cigarette may go on to become regular smokers, new research suggests. Researche

More than two-thirds of people who try just one cigarette may go on to become regular smokers, new research suggests. Researche

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问题     More than two-thirds of people who try just one cigarette may go
on to become regular smokers, new research suggests.
Researchers found that just over 60％of adults said they tried a【S1】________
cigarette at some point in their lives, with almost 69％of those noting
that they had. at least for period, gone on to smoke cigarettes daily.【S2】________
  “This shows prevention is a good idea, ”said Peter Hajek, from Queen
Mary University.
The research, that published in the journal Nicotine and Tobacco【S3】________
Research. is based on data pooled from five surveys conducting since the【S4】________
year 2000, including three each from the UK and USA, and a further
two studies from Australia and New Zealand. Together, the surveys
concluded more than 216, 000 respondents, with between 50％and 82％【S5】________
saying that, after trying a cigarette, they had gone on to smoke on a
daily basis-at least temporary. Further analysis showed that, taken【S6】________
together, an estimated 68, 9％of individuals smoked daily for a period
after trying a cigarette.
    The team also looked at whether the results were likely to be
skewed by smokers being little likely to respond in surveys than non-【S7】________
smokers, but no strong effect was found. However, the authors note
that the study also has other limitations, including that the findings are
based on respondents, self-reporting information, meaning the resulting
figures are only an estimate. “It is possible that anybody who is a【S8】________
lifetime non-smoker did try a cigarette when he was a kid but it didn’t
make any impression of him. and he doesn’t see that it is important【S9】________
enough to report. ”said Hajek. But, he added, “I think even if when【S10】________
you assume there is a recall issue, you are talking about more than a
50％conversion rate from trying a cigarette to daily smoking. ”
【S1】
选项
答案∧tried—had
解析 动词时态错误。此句主句谓语found是一般过去时态，宾语从句中的tried是发生在found之前的动作，所以应该用过去完成时态。因此在tried前加上had。
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