单选题
She ______ be in the classroom. I saw her going to the cinema just two minutes ago.
A、
mustn't
B、
shouldn't
C、
can't
D、
needn't
【正确答案】
C
【答案解析】
cant' t表示猜测时意为“不可能，一定不”；must表示猜测时意思为“一定”，这时它的反意用can't表示；mustn't意为“一定不要”；needn't不必；shouldn't不应当。
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