1.Who knocked at the door so loudly?I don’t know.
5个回答
1 who knocked
2 who
做从句的主语,所以用who
3 how soon
后面有will,表示将来时,用how soon,问多久
我不知道这桥多久就能修好
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1.I was out of the town at the time,so I don't know exactly