When I came back I noticed that he was still sitting in the office.He seemed for someone.A

问题补充：

When I came back,I noticed that he was still sitting in the office.He seemed for someone.

A. waited

B. to have waited

C. to be waiting

D. to wait

答案：

A. waited

B. to have waited

(答案→)C. to be waiting

D. to wait

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