问题
选择题
You can’t imagine what great trouble they have _________ the problem_______.
A．to solve; being talked about
B．solving; discussing
C．to solve; to talk about
D．solving; being discussed
答案
答案：D
本题考查非谓语动词。第一个空考查定语从句。 定语从句为they have _____ the problem _____.部分，其中考查词组：have trouble (in )doing sth. trouble作为先行词提前。第二个空考查词组：have sth. done 的结构，意为“使...被”