问题
选择题
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
答案
答案：C
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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
答案：C