His coming adds to the difficulty we the problem A. have to solveB. have solveC. have sol

发布时间：2020-08-16 12:31:10


His ing adds to the difficulty we       the problem
A. have to solve
B. have solve
C. have solved
D. have solving

网友回答

A. have to solve
B. have solve
C. have solved
(答案→)D. have solving
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