这个空应该填什么 every student knows the answer___ this question A.to B.for C.of D.about

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• 这个空应该填什么 every student knows the answer___ this question A.to B.for C.of D.about
• 这个空应该填什么 every student knows the answer___ this question A.to B.for C.of D.about
• who knows the answer to the question please put up your ( )
• ：（3x²y²）的-2次方（-xy的-2次方）²*（-x³y）,其中x=-1,y=8先化简,再求职