Scientists estimate ______ (还要过很多年这种药才能用在人身上). it will be many years before the

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问题 Scientists estimate ______ (还要过很多年这种药才能用在人身上).

选项

答案 it will be many years before the medicine can be used on human beings

解析本题测试句子结构“it+be+时间+before”。

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