一What are you going to do this weekend?一Well，we’ll clean up the city parks _______ it rains .
#38406
A
if
B
until
C
while
D
unless
推荐题目
---- does your sister surf the internet?---- About once a week.
#43972
A
How long
B
How often
C
How many
D
How soon
When you are trouble, why not phone the ?
#43197
A
at, police
B
in, policeman
C
in, police
D
at, policeman
He has lived here for about 20 years ,so he has friends here.
#35378
A
most of
B
lot of
C
plenty of
D
many of