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________, 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
D
考查非謂語動詞。主語the boy與lose之間是主謂關系，所以用現在分詞，且分詞的動作發(fā)生在謂語動詞之前，所以用現在分詞的完成式。句意：丟了鑰匙之后這個小男孩不能進入他的房子。所以選D。
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