问题描述：
1.Have you found the key____your door_____your house?
A.of;to B.to ;of
C.of;of D.to;to
2.How long have you______?
A.borrowed the book B.bought the bike
C.been back D.received the letter
第二题为什么不选D?
A.of;to B.to ;of
C.of;of D.to;to
2.How long have you______?
A.borrowed the book B.bought the bike
C.been back D.received the letter
第二题为什么不选D?
问题解答：
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