题文
He is only too ready to help others, seldom, ______, refusing then they turn to him for help.
| A．if so |
| B．if ever |
| C．if not |
| D．if any |
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He is only too ready to help others, seldom, ______, refusing then they turn to him for help.
| A．if so |
| B．if ever |
| C．if not |
| D．if any |
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