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- Hi, Mary. Any idea where Bill is? - He in the library. I saw him reading books

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- Hi, Mary. Any idea where Bill is? - He in the library. I saw him reading books

— Hi, Mary. Any idea where Bill is?

   — He ______ in the library. I saw him reading books there just now.

A. shall be            B. should have been         C. must be        D. might have been

试题答案

C