2. 专升本
  3. —"Have you seen Mary today?" —"No, I think she______ away on her vacation. "

—"Have you seen Mary today?" —"No, I think she______ away on her vacation. "

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问题 —"Have you seen Mary today?" —"No, I think she______ away on her vacation. "
选项 A、must be
B、may have been
C、must have been
D、might have been
答案C
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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