When jim saw me,he opened the door at once

题目

When jim saw me,he opened the door at once
同义句 Jim opende the door ------ -------- ------ he saw me
To be on time for a meeting is important
--------- -------- to be on time for a meeting
The boy was supposed to Knock on the door before the entered the room
The boy was supposed to Knock on the door ------- ------- the room

答案

as soon as

It's important

before entering


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