题目内容

It is reported that large amounts of locusts(蝗虫) _____ in their activity in the north now.
A.isB.areC.wasD.were
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。
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