Question

---Can you tell me something about metal ?
---Metal        making machines and many other things .

A．used to

B．is used for

C．is used as

D．is used to

Answer 1

B

此題重點考查be used to doing sth、used to do sth 、be used as和be used for doing sth四個個句型結構的區別和意義。be used to doing sth是習慣做某事，used to do sth表示過去常常做某事，現在不做了。be used as是把…用作…be used for doing sth表示被用來做某事。