【題目】When he arrives at the bus stop, the bus for 20 minutes.

A. has left B. had left

C. has been away D. had been away

【答案】C

【解析】本題考查時態(tài)。由于從句是一般現(xiàn)在時，所以主句也應用相應的現(xiàn)在時態(tài)，故排除B和D項；而A項中l(wèi)eft是非延續(xù)性動詞，不能和for 20 minutes連用，所以本題選C。

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