Talk to the service staff in advance,()is a good way to avoid the heavy online traffic on the day.

科目名称：理工英语3

试卷号：11377

题型：词汇与结构(单选题)

题目：Talk to the service staff in advance,()is a good way to avoid the heavy online traffic on the day.

选项：A. that B. which C. what

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答案：B. which