问题
单项选择题
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
答案
参考答案：A
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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