Oh, my God! Is this your room? The furniture here remains with such thick dust!A. covered

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(答案→)A. covered
B. covering
C. to cover
D. be covering
解析：考查remain的用法：句意：天哪，这是你的房间吗？这里的家具仍然如此厚的灰尘。Remain这里是连系动词，后面可以接名词，形容词，介词短语、现在分词，过去分词，不定式做表语，因为The furniture和cover是被动关系，用过去分词做表语。选A。