【单选题】You can't fancy what great trouble they have _______ the problem ________. [ ]
A.
to solve; being discussed
D.
solving; being discussed
【单选题】帧中继网是()的简化版本,称作快速分组交换技术。
【单选题】You can’t imagine what great trouble the doctor had ______ the patient.
【简答题】He always has great trouble (understand) _____ what the teacher says in class.
【单选题】以下计算机软件著作权权利中,( )是不可以转让的。
【单选题】--- ________ great fun chatting online is! ---But it may cause you a lot of trouble.
【简答题】Mary always has great trouble (understand)______what the teacher says in class.