All I got was a busy （）when I dialed his number.A.sign

All I got was a busy （）when I dialed his number.A.sign
B.noise
C.signal
D.voice答案：C难度：1知识点：词汇与结构部分\辅导书\书A\词法A
A.sign
B.noise
C.signal
D.voice
正确答案：C
解析:词汇与结构部分\辅导书\书A\词法A