题目内容

His decision _______many years of investigation and research.

A. narrow down
B. is based on
C. investgate
D. is comprised of

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The police have to _______ their list of suspects.

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D. take into consideration

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A. 对
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麻雀在收获季节吃掉大量的谷物，应消灭这种鸟类。

A. 对
B. 错