My cell-phone  has disappeared. Who       have taken it away?
#63578
A
could
B
should
C
must
D
might
推荐题目
As a student, you must ______ your teachers.
#63571
A
show respect for
B
have respect to
C
show respects for
D
have respects to
As it turned out to be the most important meeting in the year, you ____ so casually. 
#62823
A
Shouldn’t dress up
B
shouldn’t have dressed up
C
needn't have dressed up
D
couldn’t dress up