The athlete fell off his bike when he _____ down the hill.
A．cycledB．was cyclingC．had cycledD．is cycling
B

試題分析：考查時態(tài)：句意：運動員在朝山下騎車的時候從自行車上掉下來了。因為主句是一般過去式，所以是過去正在做…，用過去進(jìn)行時，選B。
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