Since the front door is shut, you may try knocking at the back door. the front door ——青夏教育精英家教网—

摘要： Since the front door is shut, you may try knocking at the back door. the front door is shut, try knocking at the back door?

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Since the front door is shut, you may try knocking at the back door.

______ ______ the front door is shut, _____ _______ try knocking at the back door?

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