The door still remained .A. closedB. closeC. closingD. to close

问题补充：

The door still remained .

A. closed

B. close

C. closing

D. to close

答案：

(答案→)A. closed

B. close

C. closing

D. to close

解析：remained是连系动词,后面要求表语,这时的closed是过去分词.

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