.They thought about it for a long time but still couldn’t a solution.A. come overB. got

问题补充：

.

They thought about it for a long time, but still couldn’t a solution.

A. come over

B. got along with

C. came out

D. come up with

答案：

A. come over

B. got along with

C. came out

(答案→)D. come up with

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