—Look, there_____ many birds around here, but now we hardly see them. What a pity!
—Yeah! The air pollution has caused the problem!
A.areB.used to haveC.used to beD.use to be
C

試題分析:句意:看,這兒四周過去有許多鳥,但是現(xiàn)在我們幾乎看不到它們了。太可惜了!堑,空氣污染引起來這個問題。There be句型表示“某地(或某時)存在有某人(或某物),而并非某地(某人、某物或某時)擁有什么東西”,句中有若干個名詞作主語,動詞be常與后面主語中的第一個名詞在數(shù)上一致。have一般表示某人有某物。used to do sth過去常常做某事.結合語境可知選C。
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