--- You look ______,Paul. What’s the matter?--- I’m having trouble ______ math.
A．tired, to learnB．worried, learningC．frustrated, to learnD．a(chǎn)ngrily, learning
B
B 根據(jù)句意得知，Paul因不會(huì)數(shù)學(xué)題而顯得擔(dān)心、憂慮。故第一個(gè)空填worried；固定句型have trouble (in) doing sth.“做某事有困難”，故選B。
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