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

题型：单选题题类：常考题难易度：普通

湖北省2017届九年级英语专题练习：现在进行时和过去进行时

A、become B、are becoming C、is becoming D、have became

举一反三

一 He a meeting now. Can I take a message?

— Yes. They are in the living room.

—I'd like to, but my father ____for me outside.

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