单选题I won't tell Jacket the answer to the puzzle until he——it

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单选题I won't tell Jacket the answer to the puzzle until he——it over for more than an hou
I won't tell Jacket the answer to the puzzle until he——it over for more than an hour.
A.has been thinking B.had thought C.will think D.will have thought
想不通.麻烦给我解释一下各个选项,

not untill是知道.才得意思.
所以整句的句意就是“除非他想这个问题想了超过一个小时不然我是不会把答案告诉他的”.
首先呢分析答案的失态 A为现在完成进行时 B为过去完成时 C为一般将来时 D为将来完成时通过句意就可以首先排除B
而主句是一般将来时了所以就只能选择A答案.
不知道是不是解释清楚了呢?

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