--- 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 |
--- 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 |
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