If you don’t understand how to install the equipment you ______ , please call on

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问题 If you don’t understand how to install the equipment you ______ , please call one of our customer service representatives for assistance.

选项 A、have purchased
B、purchased
C、purchase
D、purchasing

答案 A

解析语法题。观察句子可知。“you________”是用来修饰“the equipment”的定语从句，从句中省略了that，所以此处缺少谓语成分。而“put-chase”动作的发生，在打电话求救之前，存在明显的先后关系，所以用现在完成时，故选A。

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