. His efforts to persuade him to make a donation were ____ because he showed no intention to take a cent out of his pocket.
| A．in place | B．in sight | C．in vain | D．in effect |
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. His efforts to persuade him to make a donation were ____ because he showed no intention to take a cent out of his pocket.
| A．in place | B．in sight | C．in vain | D．in effect |
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