题目内容
We were about to go out for a walk ________ it began to rain.
| A.while | B.before | C.as | D.when |
D
考查固定结构。Be about to do…when…,正要做某事,这时……。句意:我们正要去散步这时下起雨来。选D。
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| A.while | B.before | C.as | D.when |