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    【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(xiàng)研究以找出報(bào)紙變綠的原因。

    考查動(dòng)詞詞組。work out算出,起作用;find out查明;get out出去,外出;look out當(dāng)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(dá)目的,是要查明原因find out the reason。故選B。

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