Mary ________ be Canadian, for she's got a British passport.

Mary ________ be Canadian, for she's got a British passport.
A、can't
B、isn't able to
C、mustn't
D、needn't
【正确答案】：A
【题目解析】：can't be不可能是；isn't able to be不能是；mustn't禁止；needn't不需要句意：玛丽不可能是加州人，因为她有英国的护照。