--- Listen! David is talking happily with his mother in the next room. --- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.
#77427
A
should
B
must
C
can’t
D
mustn’t
推荐题目
I ________worry about my weekend—I always have my plans ready before it comes.
#63400
A
can’t
B
mustn’t
C
daren’t
D
needn’t
Though _______ money, his parents managed to send him abroad.
#63519
A
lacked
B
lacking of
C
lacking
D
lacked in
Overloaded with work, school teachers now get far less sleep than they ______.
#62230
A
shall
B
should
C
may
D
might
Don’t be angry with us. We _____ with you together, but we were busy with our final reports when you called in.
#62685
A
would eat out
B
could have eaten out
C
should eat out
D
must have eaten out
I _______ keep dogs for protection, but now I keep them as pets.
#78113
A
would rather
B
had better
C
used to
D
have to