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英语语法C1,Alice came back home teh day before yesterday.Really?

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英语语法C
1,Alice came back home teh day before yesterday.
Really? where_____
A has she been B, had she been
为什么不能用完成时?
2,Has Jack finished his homework yet?
I have no idea; he _____ it this morning.
A, was doing B, had been doing C has done D, did
本句问句是现在完成时.答语该怎么回答? 保持一致 也用完成时?
还是根据this morning用过去时? 那么是用A还是D?
请用排除法进行一一分析
1 B
因为第一句的时间状语是 ten day before yesterday,是过去的过去,所以用过去完成时
2选A
问句是Jack完成了作业了吗?
回答是:他整个上午都在做
因为是发生在过去的,又是持续进行的状态,所以用过去进行时