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1、Has Sam finished his homework today

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1、Has Sam finished his homework today
I have no idea .He________it this morning .
A、did B、has done C、was doing D、had done
2、My mind wasn't on what he was saying so I'm afraid I ______ half of it .
A、was missing B、had missed C、was missed D、missed
1、Has Sam finished his homework today
C 过去进行时,表示早上正在进行的动作.
Sam 今天完成家庭作业了吗?
我不知道.今天早上的时候他正在做.
D 仅指过去的某种状态.
我的心思不在他的话语上,所以我恐怕错过了一半的信息.