-I’d like to help the homeless people in the earthquake. -You ________ join a volunteer group. 
#74891
A
must
B
need
C
can
D
couldn’t
推荐题目
-Thank you for your gift. -________________
#77112
A
The same to you.
B
You’re welcome.
C
Thank you.
D
Good idea.
–– ________ I come back before 6 o’clock?–– No, you _______ . But you ______ be back later than 7 o’clock.
#75632
A
Need; must; must
B
May; mustn’t; can’t
C
Can; can’t; can’t
D
Must; needn’t; can’t