题目内容
Metal ________ making machines and many other things．
[ ]
A．used to
B．is used for
C．is used as
D．is used to
答案：B
练习册系列答案
阅读快车系列答案
相关题目
Metal ______making machines and many other things.
| A．used to | B．is used for | C．is used as | D．is used to |