______ does Mr. Johnson go to London on business?"At least once a month.

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问题  ______ does Mr. Johnson go to London on business?"At least once a month.

选项 A、How many
B、How long
C、How often
D、How

答案C

解析 本句话的关键是明确问句与回答的对应关系。由于本对话的回答是"一个月至少一次"。其问句肯定是"多久…?"。C选项how often意思为"多久",是正确答案。
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