--Do you know when Tonny came back last night?Yes. It was not yet nine o’clock

问题补充：

----- Do you know when Tonny came back last night?

----- Yes. It was not yet nine o’clock he came back home.

A. before

B. when

C. that

D. until

答案：

A. before

(答案→)B. when

C. that

D. until

解析：考查固定句型。句意：当他回家的时候，还没有到9点。A项必须和一段时间连用。选择B项，在nine o’clock前面加at; D项的意思与句子不符。

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