How long ___ it ___ you to work out such a difficult problem?A、did,take B、does,take C、did,cost

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How long ___ it ___ you to work out such a difficult problem?A、did,take B、does,take C、did,cost

How long ___ it ___ you to work out such a difficult problem?A、did,take B、does,take C、did,cost
How long ___ it ___ you to work out such a difficult problem?A、did,take B、does,take C、did,cost

How long ___ it ___ you to work out such a difficult problem?A、did,take B、does,take C、did,cost
A
it takes sb. some time to do sth. 因为这里说的是过去所解决的问题,所以用过去时.

A.it akes sb some time to do sth固定句型

答案选 A ;
How long did it take you to work out such a difficult problem? = 解出这样一道难题,花了你多长时间?

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