As students, we ________ study hard to make our country more beautiful and stronger.
#77520
A
should
B
may
C
can
D
could
推荐题目
— If you listen to me, you ______ take a good rest at once.— OK, I ______ do so.
#62849
A
should; must
B
shall; will
C
must; would
D
may; can
Mary _______ be in the hospital. I saw her play basketball a minute ago.
#62940
A
mustn’t
B
shouldn’t
C
can’t
D
may not
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