—When _________ the car _______ ?

—Sorry. I don’t know.

A. does; invent   B. did; invent      C. was; invent      D. was; inventing

 

【答案】

C

【解析】考查點(diǎn)：被動(dòng)語(yǔ)態(tài)。解題思路：the car 作主語(yǔ)，用被動(dòng)語(yǔ)態(tài)。

 

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