【題目】Optimism is the essential ingredient of top performers,__________we assume separates the high achievers from the rest.

A.asB.whoC.whichD.that

【答案】C

【解析】

考查非限制性定語(yǔ)從句。句意：樂(lè)觀是優(yōu)秀表現(xiàn)者的基本要素，我們認(rèn)為這是成功人士與其他人的區(qū)別。分析句子結(jié)構(gòu)可知，此處引導(dǎo)非限制性定語(yǔ)從句，修飾先行詞the essential ingredient，且先行詞在從句中作主語(yǔ)，指代the essential ingredient應(yīng)用關(guān)系代詞which，we assume為插入語(yǔ)。A選項(xiàng)中as引導(dǎo)非限制性定語(yǔ)從句時(shí)，有“正如”之意；B選項(xiàng)who在從句中指代人，不符合；D選項(xiàng)that不能引導(dǎo)非限制性定語(yǔ)從句。故選C。

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