第三次在线作业
窗体顶端
单项选择题
(共40道题)收起1.（2.5分） --How about taking a break?--______.
A
、Thank you
B
、Good idea
C
、See you
D
、Good-bye
我旳答案：
B此题得分：
2.5分2.（2.5分） Seldom ____ any mistakes during my past few years of working here.
A
、would I make
B
、did I make
C
、I did make
D
、shall I make
我旳答案：
B此题得分：
2.5分3.（2.5分） Not until all the fish died in the river, _____ how serious the pollution was.
A
、did the villagers realize
B
、the villagers realized
C
、the villagers did realiz ...