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
B. is used for
C. is used as
D. is used to
B
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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 |