look t_ the keyhole when you hear the doolbell ,If there are strangers ,ask "who is "

填写：towards；it
翻译：当你听到门铃响的时候,看向猫眼,如果是陌生人,就问：“是谁?”who is _? 不是改天that吗？一般来说，在不知道对方是谁的情况下，都用it，比如打电话不知道对方是谁，也可以这样问who is it? 一般是在敲门时屋里人问屋外人的，意为“是谁啊，谁？”who is that? 一般是向别人询问“那个人是谁”没有who is this ?这种说法吗。就是在敲门时问的？who is it? 一般是在敲门时屋里人问屋外人的，意为“是谁啊，谁？”但是这个题我打的时候丢了个字母 look t_ the keyhole when you hear the doolbell ,If there are strangers ,ask "who is t _?"Who is that? 电话用语：哪位（打来的电话）？---(This is) Mary speaking.= (It's) Mary speaking. = (It's) Mary here. 是Mary.我想，同理用来敲门也可以用恩！谢谢那你看看这个怎么做：keep a l_ of phone number to call foi help such as 110 ,the police station or a n_ numberlist后面那个不太会