(2014·天一一中检测)It just isn’t fair；________I was working as a waiter last month，my friends were lying on the beach.
#30031
A
whenever
B
though
C
for
D
while
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Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
#32683
A
before
B
when
C
since
D
until
Everything was placed exactly ________ it used to be before she left the laboratory.
#30251
A
why
B
when
C
where
D
though
This summer North China was attacked by such a terrible heat few people has ever experienced before.
#30617
A
that
B
and it was
C
which
D
as