–How long has Mr. Liu taught English?     --- _______ 1998.     
A. Since     
 B. In
C. For 
D. At
A

試題分析:有how long可知詢問(wèn)的是時(shí)間段，有四個(gè)項(xiàng)的提示可知選A。表示從1998年以來(lái)。
點(diǎn)評(píng)：根據(jù)題意，正確區(qū)分介詞的用法since作介詞時(shí)，后接表示過(guò)去時(shí)間點(diǎn)的名詞；for后跟時(shí)間段；in后面跟時(shí)間段，并且是表示年，月，常用于一般過(guò)去時(shí)；at后跟時(shí)間點(diǎn)。
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