-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(jì)算出它來(lái)了。結(jié)合語(yǔ)境可知本句描述的是現(xiàn)在已經(jīng)完成的動(dòng)作，故用現(xiàn)在完成時(shí)態(tài)。選Ｄ。
考點(diǎn)：考查時(shí)態(tài)

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