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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科目：高中英語(yǔ) 來(lái)源：0123 月考題 題型：單選題

Every possible means ______ but no one knows which is suitable.
[     ]
A. has discussed
B. have been discussed
C. has been discussed
D. were discussed

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