Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.A.before B.after C.since D.when这种before 和when还有after老搞不清楚,怎么区别选择?答案不是B,C额,老选不对这类题目
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![Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.A.before B.after C.since D.when这种before 和when还有after老搞不清楚,怎么区别选择?答案不是B,C额,老选不对这类题目](/uploads/image/z/860537-65-7.jpg?t=Scientists+say+it+may+be+five+or+six+years+____+it+is+possible+to+test+this+medicine+on+human+patients.A.before+B.after+C.since+D.when%E8%BF%99%E7%A7%8Dbefore+%E5%92%8Cwhen%E8%BF%98%E6%9C%89after%E8%80%81%E6%90%9E%E4%B8%8D%E6%B8%85%E6%A5%9A%2C%E6%80%8E%E4%B9%88%E5%8C%BA%E5%88%AB%E9%80%89%E6%8B%A9%3F%E7%AD%94%E6%A1%88%E4%B8%8D%E6%98%AFB%2CC%E9%A2%9D%EF%BC%8C%E8%80%81%E9%80%89%E4%B8%8D%E5%AF%B9%E8%BF%99%E7%B1%BB%E9%A2%98%E7%9B%AE)
Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.A.before B.after C.since D.when这种before 和when还有after老搞不清楚,怎么区别选择?答案不是B,C额,老选不对这类题目
Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
A.before B.after C.since D.when
这种before 和when还有after老搞不清楚,怎么区别选择?
答案不是B,C额,老选不对这类题目
Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.A.before B.after C.since D.when这种before 和when还有after老搞不清楚,怎么区别选择?答案不是B,C额,老选不对这类题目
A
结合整句话的意思:
科学家们说在这种药被尝试用来治病救人之前还需5~6年.
给你造三个句子,希望能帮你理解。After the war , many people lost their homes. When you grow up you can choose any job you want. I wont get the points before you accept my answer.
C
It's+时间+since+从句
A啊,弄清意思,答案就出现了
选B
这道题是说```
科学家们说将在5到6年以后这个药品的才可能在病人上实验```
before是在什么什么之前进行的```
when是在什么什么的时候也在进行着什么
after 是在什么什么之后进行的``