题文
It’s necessary _____ the dog’s fur and play with it for _______.
| A．brushing, sometimes | B．to brush, sometime |
| C．brushing, sometimes | D．to brush, some time |
It’s necessary _____ the dog’s fur and play with it for _______.
| A．brushing, sometimes | B．to brush, sometime |
| C．brushing, sometimes | D．to brush, some time |
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