问题
选择题
I was about to go to bed _____ one of my old classmates made a call to me.
A．that
B．as
C．while
D．when
答案
答案：D
考查固定结构。Be about to do sth when…正要做某事在这时….（意料之外的事情发生）；句意：我正要上床睡觉，在这时我的一个老同学打了个电话给我。
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