题目内容
Right now the government is trying to control the number of people who________by H1N1 flu.
A.have been affected B.have affected C.are affected D.affect
C
考查动词的时态语态。句意为:政府正在试图控制感染H1N1流感的人的数量。人们被感染流感,用sb.be affected by sth.结构,这里说的是现在的一般情况,故用一般现在时的被动语态。

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