[答案]D

　　21．(2011·吉林东北第三次摸底)This is the second time I ________ the Himalayas as a college student.

　　A. climb

　　B. had climbed

　　C. climbed

　　D. have climbed

　　[解析]分析句子可知此题属于固定结构的考查：This is/was the＋first/second(序数词)．..time(that)＋主语＋现在完成时/过去完成时＋...。例如：This is the first time that I has gone to Beijing.这是我第一次去北京。It was the second time that she had been there.这是她第二次到那儿。所以此题选择 have climbed。

　　[答案]D

　　22．(2011·抚顺六校联考)The last few years ________ many disasters in and out of China, from earthquake to drought.

　　A. see

　　B. are seeing

　　C. have seen

　　D. saw

　　[解析]句意：刚刚过去的几年见证了国内外从地震到干旱的许多自然灾害。分析结构可知，the last few years 为句子主语，含有它的句子要用现在完成时，强调对现在造成的结果，故C项正确。

　　[答案]C

　　23．(2011·徐州一检)—Hello, John, how are you? Are you busy now?

　　—Not really. I ________ my report. And now I am watching an American movie on TV.

　　A. finished

　　B. have finished

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