–How long has Mr. Liu taught English?     --- _______ 1998.     A. Since      B.

–How long has Mr. Liu taught English?     --- _______ 1998.     A. Since      B.

题型:不详难度:来源:
–How long has Mr. Liu taught English?     --- _______ 1998.     
A. Since     
 B. In
C. For 
D. At

答案
A
解析

试题分析:有how long可知询问的是时间段,有四个项的提示可知选A。表示从1998年以来。
点评:根据题意,正确区分介词的用法since作介词时,后接表示过去时间点的名词;for后跟时间段;in后面跟时间段,并且是表示年,月,常用于一般过去时;at后跟时间点。
举一反三
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