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【题目】Knowing smoking ________ their health, some people still keep on smoking.
A.has endangered
B.had endangered
C.endangers
D.endangered

【答案】C
【解析】由主句用一般现在时可知在knowing后所跟宾语从句,说的是现在的情况,因此也使用一般现在时,endanger是及物动词,后面直接接宾语。句意:虽然知道吸烟危害健康,一些人仍然吸烟。根据句意,故选C。

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