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

試題分析:for為了,對于;if是否,如果;before在……之前;since自從……以來。句意:在你開始學英語之前,你已經(jīng)學會了多少單詞?結合語境可知選C。
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