Doctors feel really worried that ______. According to the study, the number of Americans who reported at least one severe sunbu

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问题 Doctors feel really worried that ______.
According to the study, the number of Americans who reported at least one severe sunburn rose from 30% to 39% ______.

选项 A、from 1986 to 1996
B、from 1987 to 1997
C、during 1997
D、during 1996

答案A

解析
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