题目内容
【题目】The volunteers put up many signs to remind people ________ the environment.
A.protectB.to protectC.protectingD.protected
【答案】B
【解析】
略
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题目内容
【题目】The volunteers put up many signs to remind people ________ the environment.
A.protectB.to protectC.protectingD.protected
【答案】B
【解析】
略