2. 外语
  3. While he ______ the flowers it began to rain. He put up his umbrella and went on waiting.

While he ______ the flowers it began to rain. He put up his umbrella and went on waiting.

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问题 While he ______ the flowers it began to rain. He put up his umbrella and went on waiting.
选项 A、watering
B、was watering
C、watered
D、had watered
答案B
解析 当while，when等连词引导时间状语从句时，从句谓语动词一般用进行时态，这里表达过去的事情，所以选择过去进行时．即过去正在进行的动作，所以选B。
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