题文
Mary was only too ready to help others, seldom, ______ refusing them when they turned to her.
| A．if never | B．if not |
| C．if any | D．if ever |
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Mary was only too ready to help others, seldom, ______ refusing them when they turned to her.
| A．if never | B．if not |
| C．if any | D．if ever |
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