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

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问题 The reason that water problem will become more and more serious is ______.
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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