According to the air traffic rules, you ___ switch off your mobile phone before boarding.
#87048
A
may
B
can
C
would
D
shall
推荐题目
It is required that no smoking ______ in the school.
#89784
A
was allowed
B
be allowed
C
would be allowed
D
had been allowed
- - How dangerous it was!- - Yes, but for the passer - by' s quick action, the child _____．
#86794
A
was drowned
B
could have been drowned
C
had been drowned
D
should have drowned
Just imagine performing such an opera as Turandot in the Forbidden City there _____ be a better setting!
#87965
A
mustn’t
B
shouldn’t
C
couldn’t
D
needn’t
＿＿＿＿the fog, we should have reached our school.
#89952
A
Because of
B
In spite of
C
In case of
D
But for