2．--Do you think Mary will pass the exam this time？
-I think so．She_____for it for months．（　�。�
A．is preparingB．was preparing
C．has been preparingD．had been preparing

分析 --你認為瑪麗這次會通過考試嗎？
---我認為會的．她為這次考試準備了數(shù)月了．

解答 答案：C．根據(jù)Do you think Mary will pass the exam this time可知考試還沒有進行，所以她現(xiàn)在還在為考試做準備，而for months表示準備工作從過去開始一直到現(xiàn)在，所以用現(xiàn)在完成進行時，答案是C．D是過去完成進行時．

點評 考查現(xiàn)在完成進行時．prepare和prepare for 的用法
1）prepare：準備，后接直接準備的對象，謂語動作直接體現(xiàn)在賓語上．
eg．Mother is preparing lunch．（母親正在準備午飯．）
2）prepare for：為…作準備，for 后的賓語為準備的目的．
eg．The students are preparing for the exam．（學生們正在為考試作準備．）

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