摘要：31．-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
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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
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?
查看习题详情和答案>>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
查看习题详情和答案>>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
查看习题详情和答案>>Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
| A．when | B．after | C．before | D．since |