题目内容
The athlete fell off his bike when he _____ down the hill.
| A．cycled | B．was cycling | C．had cycled | D．is cycling |
B
解析试题分析：考查时态：句意：运动员在朝山下骑车的时候从自行车上掉下来了。因为主句是一般过去式，所以是过去正在做…，用过去进行时，选B。
考点：考查时态
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