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Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A.since B. before C. after D. when
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A.since B. before C. after D. when
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A. since B. before C. after D. when
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A. since B. before C. after D. when
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A.since B. before C. after D. when
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