单选题
26.
—"Have you seen Mary today?"
—"No, I think she ______ away on her vacation."
A、
must be
B、
may have been
C、
must have been
D、
might have been
【正确答案】
C
【答案解析】
表明对过去事情的猜测，表示一定，语气要比may和might强烈。must be是表示对现在或将来的推测。
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