I didn't see you at Jim's party last week．
I had to work that evening， so I _________ go．（ ）
A．needn'tB．mustn'tC．couldn'tD．shouldn't
I didn't see you at Jim's party last week．
I had to work that evening， so I _________ go．（ ）
A．needn'tB．mustn'tC．couldn'tD．shouldn't
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