More people die of tuberculosis(结核病)than of any other disease caused by a single agent. This has probably been the case in quit

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问题     More people die of tuberculosis(结核病)than of any other
disease caused by a single agent. This has probably been
the case in quite a while. During the early stages of the【M1】______
industrial revolution, perhaps one in every seventh deaths in【M2】______
Europe’s crowded cities were caused by the disease. From【M3】______
now on, though, western eyes, missing the global picture, saw the【M4】______
trouble going into decline. With occasional breaks for war, the rates
of death and infection in the Europe and America dropped steadily【M5】______
through the 19th and 20th Centuries. In the 1950s,the introduction of
antibiotics strengthened the trend in rich countries, and the antibiotics
were allowed to be imported to poor countries. Medical researchers【M6】______
declared victory and withdrew.
    They are wrong. In the mid-1980s the frequency of infections【M7】______
and deaths started to pick up again around the world. Where
tuberculosis vanished, it came back; in many places where it had【M8】______
never been away, it grew better. The World Heath Organization【M9】______
estimates that 1.7 billion people(a third of the earth’s population)
suffer from tuberculosis. Even when the infection rate was falling,
population growth kept the number of clinical cases more or less
constantly at 8 million a year. Around 3 million of those people【M10】______
died, nearly all of them in poor countries.
【M1】

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答案in→for

解析 介词误用。这句话的意思是:这种情况可能持续很长一段时间了。动词为完成式has been,后面时间状语应当为一段时间。“for+一段时间”常用于现在完成时中。
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