Take your bank card with you when on a business trip, can save you a lot of troubles.
A. where
B. what
C. which
D. as
网友回答
A. where
B. what
(答案→)C. which
D. as
解析:句意:当你在进行商务旅行的时候,带上你的银行卡,这可以给你省去很多麻烦。通过分析句子结构,可知这个句子中包含一个非限制性定语从句,且关系词指代整个主句的内容,故用关系代词which,选C。