--- You look ______,Paul. What’s the matter?--- I’m having trouble ______ math.A.tired, to learnB.worried, learningC.frustrated, to learnD.angrily, learning
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B解析B 根据句意得知，Paul因不会数学题而显得担心、忧虑。故第一个空填worried；固定句型have trouble (in) doing sth.“做某事有困难”，故选B。