Sally paid for her travel in advance, but it wasn't necessary. A. Sally couldn't have paid for her travel in advance. B. Sally might not have paid for her travel in advance C. Sally needn't h

Sally paid for her travel in advance, but it wasn't necessary.

A. Sally couldn't have paid for her travel in advance.
B. Sally might not have paid for her travel in advance
C. Sally needn't have paid for her travel in advance
D. Sally may not have paid for her travel in advance

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Chọn C

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