22.In general the old man is generous. But he was mean to an old beggar. A. at once B.

问题补充：

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：

A. at once

B. once again

(答案→)C. for once

D. once over

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