【題目】He did a research to________the reason why the paper turned green.

A.work outB.find outC.get outD.look out

【答案】B

【解析】

句意:他做了一項研究以找出報紙變綠的原因。

考查動詞詞組。work out算出,起作用;find out查明;get out出去,外出;look out當心,向外看。根據(jù)空前“did a research”與空后“the reason why the paper turned green.”可知,空處是表達目的,是要查明原因find out the reason。故選B。

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