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3.—John，how did your monthly exam go？ —I thought I，but in fact I was among the top 5% of the students in the class. A.should have failed B.couldn't have failed C.might have failed D.needn't have failed 解析：考查情态动词表推测的用法。根据语境“John原以为是可能不过关的，但结果却名列班上5%的优生当中”。结合后文语境应选C项。 答案：C 4.My sister met him at the Grand Theatre yesterday afternoon.So heyour lecture. A.couldn't have attended B.needn't have attended C.mustn't have attended D.shouldn't have attended 解析：根据前一分句的意思可知所填部分意思是：当时不可能……，故选A。 答案：A * * * * * * * * * 2.I'll lend you moneyyou promise to return it by the end of this month. A.unless B.even if C.as long as D.as far as 解析：句意：只要你许诺月底归还，我就借给你钱。 as long as“只要”。unless“除非……”；even if“即使”；as far as“就……，远至……”。 答案：C give thought to 考虑，思考 Please don't give thought to that question. 请不要考虑那个问题了。 give sth.a thought 考虑某事 read one's thoughts 看出某人的心思 lost/deep in thought 陷入思索中/在沉思中 have no thought of (doing)... | 
