He looks so tired. What’s wrong?- Nothing serious. He just stayed up last night, hi

发布时间：2020-08-17 00:33:20

--- He looks so tired. What’s wrong?
--- Nothing serious. He just stayed up last night,     his papers.
A. to prepare
B. having prepared
C. prepared
D. preparing

网友回答

A. to prepare
B. having prepared
C. prepared
(答案→)D. preparing
解析：整个句子已经有谓语动词，所以该空应该用非谓语动词，又因为He与prepare之间是主动关系或伴随状语，故排除C；选项A表目的或将来，但是前面不用加逗号，故排除A；选项B表示它的动作发生在谓语动词之前，显然是错误的，故排除A，所以选D
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