---How often do I need to feed the birds?---They______ food every day, or they will be hungry.
#44408
A
must give
B
mustn’t give
C
must be given
D
mustn’t be given
推荐题目
They are looking forward to _____________ to the lecture by the famous professor.
#44447
A
send
B
be sent
C
being sent
D
sending
---- Drunken drive is dangerous, isn’t it? ---- Yeah. That why drunken drivers to prison even without causing accidents.
#44939
A
sent
B
are sent
C
send
D
are sending
－Oh, my God! I can't find my key to the office.－Don't worry. Perhaps it _________ at your home.
#44778
A
left
B
has left
C
was left
D
had left