Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
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A
since
B
before
C
after
D
when
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Many of them turned a deaf ear to his advice, _______ they knew it to be valuable.
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A
as if
B
even though
C
now that
D
so that
The poor young man is ready to accept ___________ help he can get.
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A
whichever
B
however
C
whatever
D
whenever
(2013·兰州模拟)Living in the eastern part of the city has its problems, shopping is not the least.
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A
with which
B
of which
C
for which
D
which
－Have you known each other for long?－Not very long, ____________ we started to work in the company.
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A
after
B
before
C
when
D
since