【題目】The number of smokers, _____ is reported, has dropped by 17 percent in just one year.
A.it
B.which
C.what
D.as

【答案】D
【解析】句意：據(jù)報道，吸煙者人數(shù)僅（過去）一年就減少了17%。as引導的非限制性定語從句位置靈活，可以置于主句的句首、句中或句末，指代的是整個一句話。故選D項。

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