题目内容

Tom didn’t understand the text ________ the teacher explained it to him.
A．whenB．whileC．untilD．since
C
本题引导的是一个时间状语从句，not……until表示直到……才的意思，本题的含义直到老师给汤姆解释了文章，汤姆才弄懂，故选C。
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