I have to do today. A. anything importantB. something importantC. important nothingD. imp

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A. anything important
(答案→)B. something important
C. important nothing
D. important something
解析：句意：今天我有很重要的事情要去做。important修饰不定代词something要放在其后面；something用于肯定句中，anything用于疑问句或是否定句中。故选B.