－Jim, how about keeping a dog as a pet?
－Good idea! but I prefer to have a cat. The dog is _____ to look after.
| A．difficult | B．more difficult |
| C．most difficult | D．the most difficult |
－Jim, how about keeping a dog as a pet?
－Good idea! but I prefer to have a cat. The dog is _____ to look after.
| A．difficult | B．more difficult |
| C．most difficult | D．the most difficult |
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