题目
Computers are useful. For example, they can ________ sending e-mail.
A.
used to
B.
be used to
C.
be used for
D.
be used
知识点：初中英语知识点》动词》动词分类》短语动词###牛津上海版（2008）》九年级第一学期》Module 2 Computers vs humans》Unit 4 Computers###牛津深圳版（广州沈阳通用）》八年级上册》Module 2 Science and technology》Unit 3 Computers###章节：Module 2