It was not until he came back __________ I left the office.

A．then

B．which

C．that

D．when

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参考答案

【译文】直到他回来，我才离开办公室。
【解析】本题考查强调句式。强调句式的形式是It…that／who…，强调物的时候用that；强调入的时候用who。本句强调时间，所以只能用that。故选c。

1 Only when he finished his homework __________ that he had made a mistake.

A．he then realized

B．did he realize

C．before he realized

D．he realized

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2 If it __________ rain tomorrow, we' 11 have the party outside.

A．wouldn' t

B．doesn' t

C．didn' t

D．won' t

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3 This is the dictionary you're looking for, __________ ?

A．isn' t this

B．isn' t that

C．isn' t it

D．isn' t there

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