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-This problem is very difficult.       -I know,but Jack has           working it out. 

A.succeed in B.succeeds in C.succeeding in D.succeeded in

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。
考点:考查时态

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