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题目
题型:不详难度:来源:
-This problem is very difficult.       -I know,but Jack has           working it out. 
A.succeed inB.succeeds inC.succeeding inD.succeeded in

答案
D
解析

试题分析:句意:这道题非常难。——我知道,但是杰克已经成功的计算出它来了。结合语境可知本句描述的是现在已经完成的动作,故用现在完成时态。选D。
核心考点
试题【-This problem is very difficult.       -I know,but Jack has           working it】;主要考察你对过去进行时等知识点的理解。[详细]
举一反三
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A.seesB.can   seeC.will seeD.has seen

题型:不详难度:| 查看答案
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A. has been to         B. has gone     C.  has gone to
题型:不详难度:| 查看答案
—How do you like China?
—Great changes _______ since I _______ here 8 years ago.
A. have taken place; came B. took place; have come C. took place; came
题型:不详难度:| 查看答案
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A. bought the car B. been dead C. joined the club    
题型:不详难度:| 查看答案
Mr. Su _____ in Zhuyuan Middle School since 1998. He regards it his second home.
A.livesB.livedC.has livedD.will live

题型:不详难度:| 查看答案
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