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
推荐题目
(2013·高考陕西卷)I have heard a lot of good things about you________I came back from abroad.
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A
since
B
until
C
before
D
when
She said she would work it out herself, ________ ask me for help.
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A
and not to
B
but not
C
and prefer not
D
rather than
Several weeks had gone by _______ I knew the painting was missing.
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A
as
B
since
C
until
D
before
You will be successful in the interview ____ you have confidence.
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A
before
B
once
C
until
D
though
It was exciting news _______ a student from China won a UN prize days ago.
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A
what
B
that
C
while
D
but