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He stepped into the office, down and began to work at once. [ ] A. sitting B. to

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He stepped into the office, down and began to work at once. [ ] A. sitting B. to

He stepped into the office, ________ down and began to work at once.

[]A.

sitting

B.

to sit

C.

having sat

D.

sat

试题答案

答案:D

解析:

分析句子结构可知,空格部分在句中作并列谓语,故用sat。