完形填空中定语从句的时态做过许多完型题,下面两个句子给我弄糊涂了：Theteacheraskedthestudentstowriteaboutthewaterfallthey()beforeandonestudent'spaperwasjustonesentence.A.visitedB.hadvisited(选A)Af

　　完形填空中定语从句的时态

　　做过许多完型题,下面两个句子给我弄糊涂了：

　　Theteacheraskedthestudentstowriteaboutthewaterfallthey()beforeandonestudent'spaperwasjustonesentence.

　　A.visitedB.hadvisited(选A)

　　Afterthejudgeheardwhat()tothem,hesaidtothebusinessman.

　　A.happenedB.hadhappened（选B）

　　第一题中我看到before便选了B,J结果错了；第二题中我吸取上题经验选A,又错了.

　　但我总觉得俩题选哪个都行,这是怎么回事?

　　第一句是个定语从句啊......