问题
选择题
I was about to get on the bus ____someone called me from behind.
A．until
B．whether
C．while
D．when
答案
答案：D
考查连词。此题是一个固定句型：be about to do … when ,即将做某事，正在那时，句意：我刚要上车正在这时有人在后面叫我。故选D。
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