题目内容
3. (2014 •甘肃白银) The zoo keeper is worried because the number of visitors smaller and smaller.
A. become B. are becoming C. is becoming D. have become
3. C
3. C 解析:the number of 意为“......的数量”,后面的动词用单数,表示现 阶段正在发生的事情用现在进行时。
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