Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
#80316
A
since
B
before
C
after
D
when
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I think everyone should donate blood _____ he is healthy because that’s a citizen’s responsibility.
#31890
A
as if
B
as long as
C
now that
D
in order that
A small car is big enough for a family of three ______ you need more space for baggage.
#31202
A
once
B
in case
C
if
D
unless
---How about camping this weekend, just for a change? ---OK, ____you want.
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A
whichever
B
however
C
whatever
D
whoever
the author wants to express in the book is the love and eare，for her family.
#30152
A
What
B
That
C
When
D
Why
The question _______ we can get enough coal for the winter has not been cleared up yet .
#33883
A
that
B
if
C
which
D
whether