David, get up early, ________ you’ll catch the early bus.
#56425
A
but
B
and
C
after
D
or
推荐题目
The rivers will become dirtier and dirtier _______ we take action to protect them.
#55533
A
since
B
if
C
until
D
Unless
Some people won’t realize the importance of their health _____they have lost it.
#56772
A
after
B
when
C
until
D
as
—Is it interesting to play computer games?—Yes, _____ you are interested in playing computer games, you’ll have trouble giving it up.
#57470
A
once
B
twice
C
as
D
as soon as