The rivers will become dirtier and dirtier _______ we take action to protect them.
#55533
A
since
B
if
C
until
D
Unless
推荐题目
—Do you have the same hobby with your brother?—No. I like collecting stamps _______ he likes reading.
#56663
A
for
B
so
C
while
D
or
－Your aunt often walks the dog in the morning.－Yeah, bad weather stops her.
#56263
A
unless
B
when
C
because
D
since
He speaks ______English ______French. Instead, he speaks German.
#56379
A
either;or
B
not only; but also
C
both;and
D
neither; nor
_ Lily _ Lucy is going with you because one of them must slay at home.
#58301
A
Not only；but also
B
Neither; nor
C
Both;and
D
Either;or