Persons under 18 _____ not be employed in night work in the US.
#63281
A
can
B
may
C
will
D
shall
推荐题目
—Everyone in my class passed the exam.—Oh, really? It ________ difficult.
#62802
A
can’t have been
B
needn’t have been
C
must be
D
mightn’t be
People who drink wine ______ to drive after May Day. 
#77648
A
don’t allow
B
isn’t allowed
C
mustn’t allow
D
mustn’t be allowed