---How much difficulty did you have________________ this physics problem?
---_____________. It's quite easy.
| A．to solve, Nothing | B．solving; None |
| C．to solve, None | D．solving; Nothing |
---How much difficulty did you have________________ this physics problem?
---_____________. It's quite easy.
| A．to solve, Nothing | B．solving; None |
| C．to solve, None | D．solving; Nothing |
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