问题
单项选择题
Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes.()
A. exclude
B. excluding
C. include
D. are included
答案
参考答案：C
解析：
结构应用。
划线部分应填本句的谓语动词(machines是主语，that use hydraulic pressure是定语)，根据句意，谓语动词应表“包括”之意，且在此不表被动，因此选项C是答案。