题目内容（请给出正确答案）

[主观题]

Scientists say it may be five or ten years ______ it is possible to test this medicine on

human patients.

A．since

B．when

C．after

D．before

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更多“Scientists say it may be five …”相关的问题

第1题

Scientists say it may be five or ten years _____

it is possible to test this medicine on human patients.

(A) since (C) after

(B) before (D) when

点击查看答案

第2题

Scientists say it may be five or ten years _____

it is possible to test this medicine on human patients.

(A) since (C) after

(B) before (D) when

点击查看答案

第3题

Scientists say it may be ten years ______ this medicine was put to use.A．sinceB．beforeC．af

Scientists say it may be ten years ______ this medicine was put to use.

A．since

B．before

C．after

D．when

点击查看答案

第4题

Scientists say it may be five or ten years ________ it is possible to test this med

icine on human patients.

A) since

B) before

C) after

D) when

点击查看答案

第5题

Scientists say it may be five or six years _____ this medicine is tested on human beings.A

Scientists say it may be five or six years _____ this medicine is tested on human beings.

A．since

B．before

C．after

D．when

点击查看答案

第6题

Scientists say it may be five or six years _____ this medicine is tested on human beings.A

Scientists say it may be five or six years _____ this medicine is tested on human beings.

A．since

B．before

C．after

D．when

点击查看答案

第7题

Scientists say it may be ten years______this medicine was put to use.A．sinceB．beforeC．afte

Scientists say it may be ten years______this medicine was put to use.

A．since

B．before

C．after

D．when

点击查看答案

第8题

Scientists say it may be ten yearsthe medicine was put to use（）

A．since

B．before

C．after

D．when

点击查看答案

第9题

请教：2010年11月北京成人本科学位英语真题试卷第2大题第26小题如何解答？

【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

答案分析：

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