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 oil wells.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 oil wells.
D．The spread of the black powder from the fires.
单项选择题
A．Move the washing machine to the basement.B．Turn the basement into a workshop.C．Repair the washing machine.D．Finish his assignment
A．Move the washing machine to the basement.
B．Turn the basement into a workshop.
C．Repair the washing machine.
D．Finish his assignment
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