我有几道英语题目要提问,回答请说明了理由,1、 you'd better not throw away those ol

我有几道英语题目要提问,回答请说明了理由,1、 you'd better not throw away those old books,
______?
A.had you B.would you
2.They scarcely dared breathe as somebody walkrd passed the door ,______?
A.dared they B.did they
3.All ______we met in hte street were soldiers.
A.that B.who C.which
第三题中hte为the