.Though the teacher had tried to make the problem easy__________, still Lily and

题型：不详难度：来源：

.
Though the teacher had tried to make the problem easy__________, still Lily and her partner were at a loss.

A．understood

B．understanding

C．to understand

D．to be understood

答案

解析

略

举一反三

.
A volunteer is a person willing to help others, one who offers to do something without__________.

A．paying

B．paid

C．being paid

D．to pay

题型：不详难度：| 查看答案

.
The coach gave the team members a call immediately the results were announced ,_____them on their success .

A． to congratulate

B．congratulating

C．congratulated

D．having congratulating

题型：不详难度：| 查看答案

.
－Why did you have to get that stamp? It’s far from beautiful．
－________my collection，of course．

A．Completing

B．To complete

C．Complete

D．Completed

题型：不详难度：| 查看答案

The 8.0-magnitude quake，centered in Wenchuan County， more than 69000 people dead．

A．left

B．leaving

C．to leave

D．having left

题型：不详难度：| 查看答案

.
Please do me a favour---_______my friend Mr. Smith to Youth Theatre at 7:30 tonight.

A．to invite

B．inviting

C．invite

D．invited

题型：不详难度：| 查看答案