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
-Excuse me. a hotel on Center Street? -No, there isn't.
#55491
A
Is there
B
There is
C
Are there
D
There are
In a position like this, one can ________ stand up _______ lie down . So it is very uncomfortable.
#55361
A
both… and…
B
either… or…
C
neither… nor….
D
not only… but also…
