How long () it () you to work out such a difficult problem?A

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How long () it () you to work out such a difficult problem?A.did…take B.does…take C.did…cost
可是为什么不选A,应该要用一般过去时啊!
还有个答句：About thirty minutes.

刚刚发生的事情会被看做是一般现在时的,例如,在直接引语变为间接引语的时候,第二个人在转述第一个人刚刚说过的话时,间接引语的宾语从句中用第一个人说话时所用的时态,他说的是一般现在时,就还用一般现在时；若第二个人在事后很长一段时间才转述第一个人说过的话时,间接引语的宾语从句中要把第一个人说话时所用的时态进行倒移,即一般现在时变为一般过去时,一般过去时变为过去完成时等等.这道题就是因为上述第一种情况的缘故,用了一般现在时.

How long () it () you to work out such a difficult problem?A How long ___ it ___ you to work out such a difficult problem How long___it___you to work out such a difficult problem? It's ______for us to work out such a difficult problem in fi you are clever.you work out the difficult problem in such a He found () difficult to work out the problem in such a shor It is clever _ you ti work _ such a difficult maths problem It is such a difficult problem___nobody can work out. The problem is too difficult.Can you _____? A.work out it B. I think .difficult to work out the problem.A,it B.this C.tha it is a difficult problem,but tom can___ work it out.A.only Jack is_that knows how to work out the problem.A