--- I have trouble _______ my new computer.
---Don’t worry. I’ll show you how _______it.
| A．using; using | B．to use; to use |
| C．using; to use | D．to use; using |
--- I have trouble _______ my new computer.
---Don’t worry. I’ll show you how _______it.
| A．using; using | B．to use; to use |
| C．using; to use | D．to use; using |
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