UC知道Scientists say it may be ten years _____
来源：百度知道 编辑：UC知道 时间：2024/05/21 06:38:02
Scientists say it may be ten years _____ this medicine was put to use.
A since B before C after D. when
请问选那个？为什么？
A since B before C after D. when
请问选那个？为什么？
A
从那时到现在已经10年了
D it is when
固定搭配
D
It's +一段时间+before ---久之后才
科学家声称十年后这种药才会被使用。
B,
科学家说，这种药可能要十年之后才能投入使用。
B 要是已经为什么还用 maybe 4楼正解
Scientists say it may be ten years _____
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