题目内容

-This problem is very difficult.       -I know,but Jack has           working it out. 
A．succeed inB．succeeds inC．succeeding inD．succeeded in
D

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。
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