Scientists say it may be five or six years _____ it is possible to test this med
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| Scientists say it may be five or six years _____ it is possible to test this medicine on human patients. |
A. since
B. after
C. before
D. when |
答案
举一反三
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A. While
B. Since
C. Before
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A. since
B. while
C. when
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A. Even if
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A. as
B. before
C. since
D. when |
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A. that
B. until
C. since
D. before |
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