--- You look ,Paul. What’s the matter?--- I’m having trouble math.
A. tired, to learn
B. worried, learning
C. frustrated, to learn
D. angrily, learning
网友回答
A. tired, to learn
(答案→)B. worried, learning
C. frustrated, to learn
D. angrily, learning
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。