______Mr. Pennington retires, he will receive an annual pension of more than fif

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问题 ______Mr. Pennington retires, he will receive an annual pension of more than fifty thousand dollars from Packard Incorporated.

选项 A、Often
B、Once
C、Whoever
D、Sometimes

答案 B

解析 Mr. Pennington retires是“主语+不及物动词”的完整结构，横线处应填入引导状语从句的连词。备选答案中只有(B)Once(一旦)是连词；且符合句意。

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