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