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Thezookeeperisworriedbecausethenumberofvisitors

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问题详情：

Thezookeeperisworriedbecausethenumberofvisitors

The zoo keeper is worried because the number of visitors ________ smaller and smaller.

A．become B．became

C．is becoming D．have become

【回答】

C

知识点：动词时态

题型：选择题

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