Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
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A
since
B
after
C
before
D
when
推荐题目
One can’t be really happy if _________he enjoys doing is regarded by society as of no importance.
#69020
A
how
B
that
C
what
D
where
Xi’an was the last city ______ he visited when he came to China.
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A
where
B
which
C
that
D
in which
The buses, most of _________ were already full, were surrounded by an angry crowd.
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A
that
B
it
C
them
D
which
When asked _________ they needed most, the kids said they wanted to feel important and loved.
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A
what
B
why
C
whom
D
which
This is the hotel _______last month.
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A
which they stayed
B
at that they stayed
C
where they stayed at
D
where they stayed