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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

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假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下短文。短文中共有10处错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在此符号下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

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