To avoid on how to operate the machine you should first read theinstructions carefully.A

问题补充：

To avoid on how to operate the machine, you should first read the

instructions carefully.

A. to get confused

B. getting confused

C. to get confusing

D. getting confusing

答案：

A. to get confused

(答案→)B. getting confused

C. to get confusing

D. getting confusing

解析：考查固定词组。固定词组avoid doing sth避免做某事；get confused感到困惑；句意：为了避免对如何操作机器感到困惑，你首先要仔细阅读使用说明。故B正确。