Only when the restaurant opened______ the owner realize that she needed more kitchen help to complete the numerous cooking tasks

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问题 Only when the restaurant opened______ the owner realize that she needed more kitchen help to complete the numerous cooking tasks.

选项 A、do
B、is doing
C、did
D、has done

答案C

解析 “Only+状语从句”(Only when the restaurant opened)位于句首,故主语和谓语动词应采用倒装形式。空格后接有主语the owner和动词原形realize,故助动词do应放在主语前面。又因从句“she needed…tasks”的动词为过去式,助动词的时态也应与之一致,即使用过去时。因此助动词do的过去式(C)did为正确答案。作为参考,应知道“Only+状语从句(或短语)”位于句首时句子应倒装。
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