—How often do I need to feed the fish?-They      food every day, or they will be hungry.
#44530
A
must give
B
mustn’t give
C
mustn’t be give.
D
must be given
推荐题目
 There is some food which _________ with your fingers.
#44451
A
can eat
B
must eat
C
can be eating
D
can be eaten
Please don’t stand up in class _____ you ______.
#44549
A
until ; are told to
B
when ; are told
C
after ; were told
D
before ; were told to
An official _____ by some reporters on food problems in Shanghai yesterday.
#44962
A
is interviewing
B
is interviewed
C
was interviewing
D
was interviewed
---Why is the classroom so dirty? --- Sorry, sir. It ______ yesterday. We forgot to do it. 
#44831
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned