The reason that water problem will become more and more serious is ______. [br]

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问题 The reason that water problem will become more and more serious is ______. [br] The words "prior to" (para.2) probably mean "______".

选项 A、. after
B、during
C、before
D、when

答案 C

解析词汇题。短语prior to的意思是“先于，在之前”。

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