It took a great deal of courage to admit that all his efforts had been .A. in vainB. in tu

发布时间：2020-08-29 23:41:55


It took a great deal of courage to admit that all his efforts had been     .
A. in vain
B. in turn
C. in return
D. in danger

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(答案→)A. in vain
B. in turn
C. in return
D. in danger
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