It is reported that large amounts of locusts(蝗蟲) _____ in their activity in the north now.
A．isB．a(chǎn)reC．wasD．were
B
考察主謂一致。large amounts of locusts大量蝗蟲是復數(shù)，故謂語動詞用復數(shù)形式，結合時間狀語now可知是表述的現(xiàn)在的狀態(tài)，故用一般現(xiàn)在時態(tài)，選B。
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