2. 职称英语
  3. A lot of experiments have been conducted________this product is put out on the m

A lot of experiments have been conducted________this product is put out on the m

游客2024-07-11  17
问题 A lot of experiments have been conducted________this product is put out on the market.
选项 A、before
B、when
C、as
D、after
答案 A
解析 主句提到已经进行了多次实验，从句提到该产品投放到市场。由句意可知，主句和从句之间存在时间上的先后关系。A项before意为“在……之前”，可以引导时间状语从句且符合句意要求。when意为“当……时”，as意为“作为”，after意为 “在……之后”。
转载请注明原文地址:https://tihaiku.com/zcyy/3672644.html
相关试题推荐
随机试题
最新回复(0)