It’s beyond their expectation what great trouble they have _____ the problem _____．
A．to solve; being discussed B．solving; discussing
C．to solve; to discuss D．solving; being discussed
人气：428 ℃ 时间：2020-01-27 00:46:33
解答
D
have trouble (in) doing sth :做sth有困难,遇到麻烦
being discussed做problem的后置定语,正在被讨论的问题
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