UC知道一道英语题 急求
来源：百度知道 编辑：UC知道 时间：2024/06/23 00:02:56
___ s seven-second delay between the transmission of the radio signal and when it can be heard
A.It is B.There is C.It has been D.There has been
A.It is B.There is C.It has been D.There has been
选B
There be 句型表示“存在，有...”
There is s seven-second delay between the transmission of the radio signal and when it can be heard .
在收音机信号传播和被接收到之间有七秒的延迟。
D.There has been
这样才通顺
b
B