Every possible means but no one knows which is suitable. [ ]A. has discussed B. have been discussed C. has been discussed D. were discussed 题目和参考答案——青夏教育精英家教网——

题目内容

Every possible means ______ but no one knows which is suitable.

[ ]

A. has discussed
B. have been discussed
C. has been discussed
D. were discussed

C

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