问题
选择题
I was about to tell him the secret _____ someone patted me on the shoulder.
A．as
B．until
C．while
D．when
答案
D
题目分析：句意：我正准备告诉他这个秘密这时有人拍了拍我的肩膀。句式be about to do …when…意为：正准备做某事这时……。故选D。
考点: 考查固定句式的用法。
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