题目内容
19．-Granny，________do you water the flowers？一Once a week．（ ）
| A． | how long | B． | how often | C． | how soon | D． | how much |
分析 奶奶，你多久浇一次花？一周一次．
解答 答案：B．根据答语：一周一次．可知疑问句中空格应该填频度副词，how often意思是：多久一次．问的是"事情发生的频率"．how long意思是：多久．对一段时间提问．how soon意思是：多快，多久以后．对（从即时起）到将来某个时刻的时间长短提问，回答通常为 in+一段时间．how much意思是：多少钱．对价格提问．how much+不可数名词，意思是：多少．根据句意：奶奶，你多久浇一次花？一周一次．应选：B．
点评 这几个短语的用法是初中阶段的重点，要牢记．
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