You look Paul. What’s the matter?I’m having trouble math.A. tired to learnB. wo

问题补充：

--- 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

答案：

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。