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1. I'll go to visit my aunt in England__________ the summer holiday starts.
A.
while
B.
before
C.
until
D.
as soon as
【考点】
连词辨析;
【答案】
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单选题
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1. We can't be successful____________ we keep working hard.
A.
if
B.
unless
C.
because
D.
when
单选题
普通
2. The rivers will become dirtier and dirtier __________we do something helpful for them.
A.
because
B.
if
C.
until
D.
unless
单选题
普通
3. Mom won't let Dick go out ________ he promises to be back by 10：00 tonight.
A.
if
B.
when
C.
since
D.
unless
单选题
困难