Scientists say it may be five years _____ it is possible to test this medicine o - 高中英语试题 - 超级试练试题库

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Scientists say it may be five years _____ it is possible to test this medicine on human patients.[ ]
A. since
B. until
C. before
D. when

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试题【Scientists say it may be five years _____ it is possible to test this medicine o】；主要考察你对连词等知识点的理解。[详细]

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A. since
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A. if
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A. when
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A. because
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