I could hear their voice but I couldn’t what they are sayingA. make forB. make upC. mak

问题补充：

I could hear their voice, but I couldn’t what they are saying．

A. make for

B. make up

C. make out

D. make off

答案：

A. make for

B. make up

(答案→)C. make out

D. make off

解析：本题的是我可以听见他们的声音，但是我听不清楚他们在说什么话，make out可以表示听清的意思，故本题选C。