英语完形填空解释
When you turn the phone on it tries to find a signal.This signal comes from the telephone network.Usually,if the signal is weak,_1_ can be difficult to make a phone call.（（When the phone is finding a signal,it also sends a message to the telephone network.））If you have s signal you can see it on the phone's screen.This message tells the station where the phone is.
1.选项有A.it B.you
但是B也能说得通啊!
2.还有打括号的句子中的it指的是“手机”还是“信号”?