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英语完形填空解释When you turn the phone on it tries to find a signal

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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”?
英语完形填空解释When you turn the phone on it tries to find a signal
介个...
it can be是可能的意思吧,这里的it我认为指的是手机信号弱的情况,it's adj.to do是一个句型,表示做什么事怎么样...
意会意会哈T.T
括号里的it指的是手机