Food safety is important. Rules _____ to stop people from food pollution.
#44569
A
must make
B
must be made
C
mustn’t make
D
mustn’t be made
推荐题目
---Where’s your mother?   ---Oh, she ______ Shanghai on business. 
#44748
A
have been to
B
have gone to
C
has been to
D
has gone to
As everyone knows, rubbish _______ everywhere.
#44969
A
need be thrown
B
mustn’t be thrown
C
can’t throw
D
may throw