问题
选择题
In the future, senior citizens will be able to go anywhere using high-tech cameras _______ to their head.
A．attaching
B．attached
C．to attach
D．attaches
答案
答案：B
考查非谓语动词用法。Camera与attach构成被动关系，使用过去分词。
搜题请搜索小程序“爱下问搜题”