选择B.
括号外的中文意思是：你做伟大的志愿者
推理应该是填入多久即how long.
其他几个意思：
how often :多久一次,强调频率
how far：多远,强调距离
( )have you been a great volunteer?A.How ohten B.How long C.
3个回答
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