问题描述：
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
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
问题解答：
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