They repeated the experiment several times ______ they were sure that the result

游客2024-07-22 39

问题 They repeated the experiment several times ______ they were sure that the result was reliable.

选项 A、until
B、for
C、since
D、when

答案 A

解析 until引导时间状语从句，表示动作持续到某一时间点。其他选项不合题意。例如：He waited for his friend at the bus stop until the last bus came．(他在车站等他的朋友，一直等到最后一班车来。)

转载请注明原文地址:https://tihaiku.com/zcyy/3687652.html

相关试题推荐

随机试题

最新回复(0)

Theincreaseinpopulationinthatregionresultedinafood(short)______.sho