If the dolphin is ___, it will be as clever as human beings. 单选题 (10 分) 10分 A. properly to train B. properly trained C. to train properly

If the dolphin is ___, it will be as clever as human beings.
单选题 (10 分) 10分
A.
properly to train

B.
properly trained

C.
to train properly

出自：国家开放大学理工英语21

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