19．Miss Gao came to our school in 2006．She _____ here for four years．（　　）
A．teachesB．taughtC．has taught

分析 2006年，高老師來到我們學校．她已經(jīng)在這兒任教四年了．

解答 答案：C 現(xiàn)在完成時基本用法之一：表示過去已經(jīng)開始，持續(xù)到現(xiàn)在，而且還可能繼續(xù)下去的動作或狀態(tài)，常與since或for引導的時間狀語連用．結(jié)合句意，根據(jù)for four years，可知應該用現(xiàn)在完成時態(tài)．現(xiàn)在完成時態(tài)的構成：助動詞have/has+過去分詞，根據(jù)主語She是第三人單數(shù)，所以應該用has，故選：C．

點評 本題主要考查動詞時態(tài)，做此類題目一定注意時間狀語、標志詞．根據(jù)上下文所表達的含義，做出判斷．同時更應記清時態(tài)的構成形式．就本題而言，主要考查現(xiàn)在完成時態(tài)．

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