单项选择题

A．His friend gave him the wrong key.
B．He didn’t know where. the back door was.
C．He couldn’t find the key to his mailbox.
D．It was too dark to put the key in the lock.
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单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of energy resources.D．The spread of the black powder from the fires.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of energy resources.
D．The spread of the black powder from the fires.
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