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The roof fell ________ he had time to dash into the house to save his baby.

A. as                 B. after    C. until     D. before

D


解析:

本题考查before引导的时间状语从句,意为“在……之前”。句意为“他来不及冲进去救他的孩子,屋顶就塌了”。

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