The zookeeper is worried because the number of visitorssmaller and smaller.[ ]A. becomeB .becameC. is becomingD. have become-初中英语-n多题

◎ 题干

The zookeeper is worried because the number of visitors smaller and smaller.

[ ]

A. become
B .became
C. is becoming
D. have become

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◎ 解析

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◎ 知识点

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