Children are taught to give their teeth a good brush they go to bed．( )A．ifB．afterC．becauseD．before 题目和参考答案——青夏教育精英家教网——

题目内容

9．Children are taught to give their teeth a good brush ______ they go to bed．（　　）

A．

if

B．

after

C．

because

D．

before

分析要教导孩子们睡前好好刷牙．

解答答案：D
if如果，引导条件状语从句；after在…之后，before在…之前，都引导时间状语从句；because因为，引导原因状语从句；根据常识可知是睡觉前刷牙，故选D．

点评本题考查连词辨析，先弄清所给词的词义及用法，再根据情境选择正确的答案．

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