--Is Mr Smith in the office? --Yes, he is in charge, he must be there every day.
来源：网络
时间：
推荐文章
--Is Mr Smith in the office?
--Yes, ________ he is in charge, he must be there every day.
[]
A．sinceB．howeverC．whetherD．although
试题答案
答案：A
提示：since在此意为“既然”，作连接副词，引导原因状语从句. |