【題目】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】由主句用一般現(xiàn)在時(shí)可知在knowing后所跟賓語(yǔ)從句，說的是現(xiàn)在的情況，因此也使用一般現(xiàn)在時(shí)，endanger是及物動(dòng)詞，后面直接接賓語(yǔ)。句意：雖然知道吸煙危害健康，一些人仍然吸煙。根據(jù)句意，故選C。

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