题目内容

How many words have you learned_____ you began to learn English?
A．forB．ifC．beforeD．since
C

试题分析：for为了，对于；if是否，如果；before在……之前；since自从……以来。句意：在你开始学英语之前，你已经学会了多少单词？结合语境可知选C。
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