16．A good teacher must be able to hold his students'attention ____ he reaches the end of the class．（　�。�
A．whenB．afterC．untilD．unless

分析 一個好老師必須能夠抓住學生的注意力，直至一堂課結(jié)束為止．

解答 答案為C 
解析：本題考查時間狀語從句中連詞的選擇，主句為A good teacher must be able to hold his students'attention，一個好老師必須能夠抓住學生的注意力；從句__he reaches the end of the class，___他結(jié)束一堂課，空格處缺少適當?shù)倪B接詞，根據(jù)分析，缺失的連詞意思為：直至，直到，結(jié)合各個選項意思，A when 當…時； B after 在…之后； C until 直到…為止； D unless 除非，故選C．

點評 本題考查時間狀語從句中連接詞的選擇，學生應(yīng)該掌握各個連接詞的詞意．

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