—Where _____ Mary have put the empty bottles? — She _____ them away. They must be somewhere. 
#63263
A
can; can’t have thrown
B
must; needn’t
C
must; must have thrown
D
can; mustn’t have thrown
推荐题目
--How does Jack usually go to school?  --He_____________ride a bike, but now he_______________there to lose weight.
#78085
A
used to, is used to walk
B
was used to, is used to walking
C
was used to, is used to walk
D
used to, is used to walking
—Must we clean the classroom now?—No ,you _______.
#76832
A
must
B
needn’t
C
aren’t
D
mustn’t