(2013·江西六所重点高中一模)We ________ take clean drinking water for granted. One day we may run out of it.
#62428
A
needn't
B
can't
C
won't
D
shouldn't
推荐题目
—Must I finish the book today?—Yes, you ________, but you ________ finish it now. Have a rest.
#75918
A
do; don’t have to
B
do; mustn’t
C
must; don’t have to
D
must; mustn’t
_____ people in the world are sending are receiving e-mails every day.
#77031
A
Million of
B
Many millions of
C
Several millions’
D
Several millions
My uncle _________ drive a car two years ago. Now he drives very well. 
#78292
A
couldn’t
B
can’t
C
mustn’t
D
shouldn’t