单选题
She ______ be a Canadian because she's got a British passport.
A、
can't
B、
isn't able to
C、
mustn't
D、
doesn't need to
【正确答案】
A
【答案解析】
can't be与must be相对，用于否定的推测，对过去动作的否定推测，用can't+不定式完成式。
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