她正在迅速考慮著對策時，忽然聽到一點兒輕微的響聲，便立即轉過身去。原來，房門鑰匙已經掉到地上。而且，正在她凝視著那把鑰匙時，又聽到了門鎖在轉動的聲音。房門開了，達金先生走了進來，隨手把房門小心地關上。

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