题目
A.since
B.when
C.after
D.before
第1题
it is possible to test this medicine on human patients.
(A) since (C) after
(B) before (D) when
第2题
it is possible to test this medicine on human patients.
(A) since (C) after
(B) before (D) when
第3题
Scientists say it may be ten years ______ this medicine was put to use.
A.since
B.before
C.after
D.when
第4题
A) since
B) before
C) after
D) when
第5题
Scientists say it may be five or six years _____ this medicine is tested on human beings.
A.since
B.before
C.after
D.when
第6题
Scientists say it may be five or six years _____ this medicine is tested on human beings.
A.since
B.before
C.after
D.when
第7题
Scientists say it may be ten years______this medicine was put to use.
A.since
B.before
C.after
D.when
第8题
A.since
B.before
C.after
D.when
第9题
【题目描述】
Scientists say it may be five or six years _____ this medicine is tested on human beings.A.since
B.before
C.after
D.when
【我提交的答案】: |
【参考答案与解析】: 正确答案:B |
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