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-----Has Sam finished his homework today?-----I have no idea

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-----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 为什么选C啊
-----Has Sam finished his homework today?-----I have no idea
C,今天Sam做完他的作业了吗?我不知道,他.今早
A,他今早做了它,做了就不会说不知道
B,has(既然是今早,就不会是现在式)done
D,今早做好了(如果做好了就不会说我不知道)
C是正确的,他在早上时正在做,所以会说(我不知道,我看见他早上在做)
望及时采纳,有问题请提出