We were about to go out for a walk ______ it began to rain.
A．whileB．beforeC．a(chǎn)sD．when
D

試題分析：考查固定句式。固定句式：be about to do sth when…正要做某事在這時…。本題中的when是一個并列連詞，意為：在那時；故D正確。
點評：固定句式：be about to do sth when…正要做某事在這時…。本題中的when是一個并列連詞，意為：在那時；對于這樣的固定句式，平時要加強(qiáng)識記。
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