Such a difficult problem__that I don't know what to do with it.A._英语解答

Such a difficult problem__that I don't know what to do with it.
A.it is B.was it C.is it D.it was

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解答

C such或者so放在句首,要使用倒装.再根据时态,所以用C
She is so pretty.= So pretty is she.