You _______ see a dentist when you have a toothache. 
#78314
A
may
B
need
C
should
D
can
推荐题目
—How did he get my telephone number?—You ________ it . You told him last week.
#63204
A
should have forgotten
B
may have forgotten
C
must have forgotten
D
could have forgotten
It was so dark outside that the little child ________ go out by himself. 
#62941
A
dare not to
B
dared
C
dares
D
didn’t dare to
You ________ in person; a telephone would have been enough.
#62344
A
couldn't have come
B
needn't have come
C
shouldn't have come
D
mustn't have come