--How much difficulty did Lucy have_______ this problem?
--_______. She's a good problem solver.
| A．to solve ; Nothing | B．solving ; None |
| C．to solve ; None | D．solving ; Nothing |
--How much difficulty did Lucy have_______ this problem?
--_______. She's a good problem solver.
| A．to solve ; Nothing | B．solving ; None |
| C．to solve ; None | D．solving ; Nothing |
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