Mary, before you buy the skirt, please think ______ it is really necessary.

A. whether
B. what
C. before
A
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科目:初中英語(yǔ) 來(lái)源:期中題 題型:單選題

Mary, before you buy the skirt, please think ______ it is really necessary.
[     ]
A. whether
B. what
C. before

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