Question

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

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

Answer 1

【答案】B

【解析】

句意：他做了一项研究以找出报纸变绿的原因。

考查动词词组。work out算出，起作用；find out查明；get out出去，外出；look out当心，向外看。根据空前“did a research”与空后“the reason why the paper turned green.”可知，空处是表达目的，是要查明原因find out the reason。故选B。