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题目
题型:不详难度:来源:
Space exploration began in the 1960s, and since then about five hundred people    into space.
A.have traveledB.traveledC.had traveled D.are traveling

答案
A
解析
本题考查时态。根据时间状语since then可知与完成时连用。句意:太空探索开始于20世纪60年代,自从那以后大约有500人游览过太空。
核心考点
试题【Space exploration began in the 1960s, and since then about five hundred people  】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
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—Well, it isn’t surprising, Our friends and relatives_______ around all the time.
A.are comingB.had comeC.were comingD.have been coming

题型:不详难度:| 查看答案
I called Hannah three times yesterday evening, but I couldn’t get through, her brother _______on the phone all the time.
A.was talkingB.has been talkingC.has talkedD.talked

题型:不详难度:| 查看答案
A red light will start continuously flashing when the batteries____ low.
A.getB.will getC.are gettingD.got

题型:不详难度:| 查看答案
Although many measures _____, the world’s economy is still going down.
A.are taken B.were taken
C.will be taken D.have been taken

题型:不详难度:| 查看答案
―Hello!May I speak to Jack, please?  
―Yes, speaking. 
-Oh, I _______ your voice at first.
A.don’t recognize.B.didn’t recognize.
C.hadn’t recognized.D.haven’t recognized.

题型:不详难度:| 查看答案
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