when a shark ______ (appear),a bell rings will tell the people to_英语解答

when a shark ______ (appear),a bell rings will tell the people to get out of the water

人气：246 ℃　时间：2019-09-24 05:05:17

解答

when a shark (appear),a bell rings will tell the people to get out of the water
条件状语从句主句是一般将来时,从句用一般现在时.