-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

解析試題分析：句意：這道題非常難�！抑�，但是杰克已經(jīng)成功的計算出它來了。結(jié)合語境可知本句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。選Ｄ。
考點：考查時態(tài)

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