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单选题
Mary _____ in the garden when it began to rain.
A
was walking
B
walked
C
walking
D
had walked
参考答案
参考解析
解析：
句意为：下雨时，玛丽正在花园里散步。“散步”这个持续动作是“开始下雨”这个瞬间动作发生的背景，因此应该用过去进行时，故为A。
句意为：下雨时，玛丽正在花园里散步。“散步”这个持续动作是“开始下雨”这个瞬间动作发生的背景，因此应该用过去进行时，故为A。
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