14．-I'm sure Tom will pass the exam．
-I think so．He _________ in the library every night over the last two months．（　�。�
A．studiesB．studied
C．is studyingD．has been studying

分析 -我確信湯姆會通過考試．
-我認為會通過．他在過去的兩個月里每晚都在圖書館里學(xué)習(xí)．

解答 答案：D 考查時態(tài)辨析．根據(jù)句中時間狀語"over the last two months"，是指截止到現(xiàn)在的兩個月里一直在學(xué)習(xí)，要用現(xiàn)在完成進行時態(tài)．A項是一般現(xiàn)在時態(tài)，指習(xí)慣性的動作；B項是一般過去時態(tài)，句中并沒有過去的時間；C項是現(xiàn)在進行時態(tài)，強調(diào)現(xiàn)在正在發(fā)生的動作．

點評 解答此類問題要了解各種時態(tài)的基本含義，并區(qū)別各種時態(tài)之間的差異，了解某些時態(tài)與一些特殊時間的固定用法，然后結(jié)合語境選擇正確答案．

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