-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 题目和参考答案——青夏教育精英家教网—

题目内容

-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

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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