题干
I couldn’t ______ where the music was coming from．Do you know it? （ ）
A：find
B：discover
C：work out
D：work on
答案(点此获取答案解析）
C
I couldn’t ______ where the music was coming from．Do you know it? （ ）
A：find
B：discover
C：work out
D：work on
