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 【查看更多】

 

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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

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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

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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

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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

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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

 

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