The question ___ us is very difficult one.A after B before C form D past个人目测选B ,求专家解析!

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The question ___ us is very difficult one.A after B before C form D past个人目测选B ,求专家解析!
The question ___ us is very difficult one.
A after B before C form D past
个人目测选B ,求专家解析!

The question ___ us is very difficult one.A after B before C form D past个人目测选B ,求专家解析!
是用before,在我们面前的这题.就是正在面对的题目.