问题
选择题
We were about to go out for a walk ________ it began to rain.
A．while
B．before
C．as
D．when
答案
答案：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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We were about to go out for a walk ________ it began to rain.
A．while
B．before
C．as
D．when
答案：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。