Metal ________ make machines and many other things.

[　　]

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

答案：D
解析：

點(diǎn)撥：金屬被用來(lái)制作機(jī)器和許多其他的東西。used to意為“過(guò)去常�！�；be used for“被用來(lái)做”，但for后跟v. -ing；be used as意為“被用作”；be used to意為“被用來(lái)做”，其后跟動(dòng)詞原形，故選D。


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