--- Do you love teaching, Miss He?
--- I fell in love with teaching in 2000. I ________ for twelve years by this summer.
A．will teachB．would have taughtC．has been teachingD．will have been teaching
D

試題分析：考查時態(tài)。本題的關(guān)鍵詞是by, By與完成時連用。當(dāng)by后面是過去的時間，使用過去完成時；當(dāng)by后面是現(xiàn)在的時間，使用現(xiàn)在完成時，當(dāng)by后面是將來的時間的時候，使用將來完成時。本題的By后面使用的是this summer這個將來的時間，故使用將來完成時，本句指教書這個動作持續(xù)到現(xiàn)在，故使用進行時的形式。故D正確。
點評：當(dāng)by后面是過去的時間，使用過去完成時；當(dāng)by后面是現(xiàn)在的時間，使用現(xiàn)在完成時，當(dāng)by后面是將來的時間的時候，使用將來完成時。
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