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The athlete fell off his bike when he _____ down the hill.

A．cycled B．was cycling C．had cycled D．is cycling

B

解析試題分析：考查時(shí)態(tài)：句意：運(yùn)動(dòng)員在朝山下騎車的時(shí)候從自行車上掉下來了。因?yàn)橹骶涫且话氵^去式，所以是過去正在做…，用過去進(jìn)行時(shí)，選B。
考點(diǎn)：考查時(shí)態(tài)

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