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

試題分析：句意：這道題非常難。——我知道，但是杰克已經(jīng)成功的計算出它來了。結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。
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