题目内容
22.In general， the old man is generous. But ____， he was mean to an old beggar.
| A．at once | B．once again | C．for once | D．once over |
C
略
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22.In general， the old man is generous. But ____， he was mean to an old beggar.
题目内容
| A．at once | B．once again | C．for once | D．once over |