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【单选题】

She must have been pretty______to fall for such an old trick.

A.
interested
B.
shrewd
C.
enthusiastic
D.
gullible
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参考解析:
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举一反三

【单选题】She must have been out last night, _______?

A.
didn’t she
B.
mustn’t she
C.
hasn’t she
D.
wasn’t she