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题目内容
（国家开放大学理工英语21）
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
单选题 (10 分) 10分
A.
properly to train
B.
properly trained
C.
to train properly
参考答案