She can’t help you today because she has her hands full. She has to go shopping, pick up her son and then cook dinner.A.is very worriedB.is very angryC.is very busyD.is on business
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C解析is very worried非常担心； is very angry非常愤怒；is very busy非常忙碌；is on business出差。句意：她不能帮助你，因为她很忙得不可开交。她必须去购物，接儿子然后做饭。结合语境可知选C。
考点：短语辨析