问题
选择题
It is reported that large amounts of locusts(蝗虫) _____ in their activity in the north now.
A．is
B．are
C．was
D．were
答案
答案：B
考察主谓一致。large amounts of locusts大量蝗虫是复数，故谓语动词用复数形式，结合时间状语now可知是表述的现在的状态，故用一般现在时态，选B。