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1.Did you see Xiao Li at the party?

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1.Did you see Xiao Li at the party?
--No,_______by the time I arrived.
为什么填she‘d left而不是she must leave?
2 They have been in the library since_______
为什么填eight o‘clock不填it had been open?
3.Return the tools to_______ gave them to you.
为什么用whoever不用whomever
4.The tigers in the zoo are heavy,_______is more than 200 pounds
.为什么填the biggest of which不用which.
5.Do you remember the day when we first met.
可不可以改成 Do you remember the day which we first met on.
6.In order to protect the environment,we are not allowed_______ the waste as we used to
为什么用to burn up 不用burning up,不是有allow doing 、allow sb to do么
1.由by the time I arrived 这个时间可知主句用过去完成时
2.since之后可接时间点也可以接一般过去时的句子,但不能接完成时.而主句一定用完成时
3.whoever作主语而whomever作宾语,此句作主语
4此句是非限制性定语从句.用which指代不明
5.可以
6.这句是被动语态,