因为这个Mark是在Question上的,所以要多一个at,而用了从句以后,which的前面也需要保留这个at.
You'd bettwe make a mark at which you have any questions.
如果去掉从句跟修饰,就是
You make a mark at the questions.
at You`d better make a mark( )you have any questions.A.at wh
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