摘要： Scientists say it will be five or six years it is possible to test this medicine on human patients. A. since B. that C. before D. when
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Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
A. after B. before C. since D. when
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Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
|
A．before |
B．that |
C．since |
D．when |
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Scientists say it will be five or six years ________ it is possible to test this medicine on humans．
- A.after
- B.before
- C.since
- D.when
Scientists say it will 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 will be five or six years _____ it is possible to test this medicine on human patients.
| A．before | B．that | C．since | D．when |