The city park will be cleaner ___________ people stop dropping litter here and there.
#56719
A
while
B
if
C
unless
D
before
推荐题目
Mary spends a lot of money on clothes _____ her family is not rich.
#58228
A
because
B
though
C
if
D
so
—I feel stressed out from time to time. Could you give me some advice?— __________ sharing your worries with your parents?
#55461
A
Why don’t you
B
Why not
C
How about
D
Would you like
---Hi! Long time no see.---Yes. It’s almost three years_____ we met last time.
#57008
A
while
B
before
C
since
D
until