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几道语法题You can arrive in Beijing earlier for the meeting ( )yo

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/21 21:10:31
几道语法题
You can arrive in Beijing earlier for the meeting ( )you don’t mind travelling by air.
为什么用provided 不是until
Government cannot operate effectively ( )it is free from such interference.
为什么用unless 不用if only
His father had promised to buy him a computer ( )he behaved himself.
为什么用provided 不用after
provided假设,如果 until 直到,在.之前 (主句动词要为延续才可以)
if only 要是.就好了(从句虚拟) 不是only if
用after的话 had promised 所表达的时间在前啊