【高一英语选择】They began to think about what use could be ____ such materials.

问题描述:

【高一英语选择】They began to think about what use could be ____ such materials.
A made up
B made from
C made of
D made out

选C made of
源于词组 make use of 表示利用某物,句子的意思是:他们开始考虑如何来利用这些材料.