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

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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
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

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
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

选A吧。it作形式主语。后面的半句把语序换一下,they have great trouble to solve the problem being discussed.后面一个空是非谓语动词作定语修饰problem.不太确定- -

A
have great trouble to solve the problem being discussed
to solve 是表目的 being discussed 后置定语,修饰problem。