All of ____ sudden,we saw a boy rush out of ___ nack door. A a;a B a;the C the;the D the;a 求解析

题目

All of ____ sudden,we saw a boy rush out of ___ nack door. A a;a B a;the C the;the D the;a 求解析
是back door

答案

答案：B.
解析：all of a sudden,“突然”,固定词组,记住就可以.the back door特指,是指谈话双方都知道的某一特指事物,所以必须用定冠词the.

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