Scientists say it may be five or six years _____ this medicine is tested on human beings. -题库考试答案搜索网

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

单选题

2022-04-24 04:41

A、since
B、before
C、after
D、when

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正确答案

B

试题解析

本题考查时间状语的连接词。题意是说“科学家们说大概要等5到6年，这种药才会在人类身上试验”。before引导时间状语从句，表示“在……之前”。

标签：成人英语三级考试成人英语三级

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

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