Although this         sound like a simple task, great care is needed.
#88073
A
must
B
may
C
shall
D
should
推荐题目
 The headmaster demanded all the teachers ______ in the office.
#86783
A
mustn’t smoke
B
did smoke
C
should smoke
D
not smoke
----Where have you been?---- I _______ stuck in the traffic. I ________ here earlier.
#86732
A
had got; would have been
B
have got; would be
C
got; had done
D
got ; would have been
Teachers recommend parents_____their children under 12 to ride bicycles to school for safety.
#86966
A
not allow
B
do not allow
C
mustn’t allow
D
couldn’t allow