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
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。