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, the boy couldn't enter his house.A.Since the key has lostB.The key been lostC.

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, the boy couldn't enter his house.A.Since the key has lostB.The key been lostC.

________, the boy couldn't enter his house.

A.Since the key has lost

B.The key been lost

C.Lost the key

D.Having lost the key

试题答案

D