The film___________ for half an hour when I got to the cinema.A.began B.begun C.

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问题 The film___________ for half an hour when I got to the cinema.

选项 A.began
B.begun
C.had begun
D.had been on

答案D

解析此句是由when引导的时间状语从句,表示“当……的时候”,相当于“at the momentwhen”,从句用一般过去式,主句就要相应地变化为过去完成时;began是个短暂性动词,不能和for连用,故应选D项。
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