-- Are these _______ all from No. 2 Middle School? -- Yes. They often _________ their free time to help the old here.
#74662
A
volunteers; volunteers
B
volunteer; volunteers
C
volunteers; volunteer
D
volunteer; volunteer
推荐题目
You_____ all those calculations! We have a computer to do that sort of thing.
#63501
A
needn’t have done
B
must not have done
C
shouldn’t have done
D
can not have done
—_____ I finish the book this week?—No, you ____ . You ____ return it to me the week after next
#75875
A
Need; mustn’t; must
B
Should; shouldn’t; may
C
Mus; needn’t; can
D
Can; don’t have to; must