问题
选择题
―The telephone is ringing.
―I _________ answer it.
A．will
B．am going to
C．am to
D．am about to
答案
A。
be going to do表示“已计划好要做某事”，be to do与be about to do有时意思一样，都是“正要做某事 (忽然另一个动作发生了)”。
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