[单选题,2分] The zoo keeper is worried because the number of visitors _____ smaller and smaller. A.become B.became C.is becoming D.have become

[单选题,2分] The zoo keeper is worried because the number of visitors _____ smaller and smaller.
A.become
B.became
C.is becoming
D.have become

出自：河南理工大学—大学英语1

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