【題目】This is the researchmany scientists attach importance.
A.to that
B.in that
C.in which
D.to which

【答案】D
【解析】句子結構分析，此空后面是定語從句，然后根據(jù)定語從句特點分析，從句中應使用短語attach importance to sth認為...重要，to sth．轉(zhuǎn)化為to which, which為關系代詞，在從句中作介詞to的賓語；當定語從句中介詞在關系代詞前時，關系代詞不可使用that；句意：這就是許多科學家非常重視的那個研究。根據(jù)句意，故選D。

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