Mary ______ my letter; otherwise she would have replied before now.
#63420
A
has received
B
ought to have received
C
couldn’t have received
D
shouldn’t have received
推荐题目
It is recommended that the project ________ not be started until all the preparations have been made.
#62972
A
must
B
can
C
need
D
should
Without gravity, we _____ walk on the ground as freely as we do now.
#63085
A
couldn’t
B
mustn’t
C
shan’t
D
needn’t
—Is Jack on duty today? —It_____ be him. It’s his turn tomorrow.
#62168
A
mustn’t
B
won’t
C
can’t
D
needn’t