题目内容
20．-Look at the flowers I gave you last month．They are dying!________ do you water them？-Sorry，I forgot to water them．（ ）
| A． | How long | B． | How often | C． | How soon | D． | How much |
分析 --看看我上个月给你的花．他们快死了！你多久给他们浇一次水？--对不起，我忘了给他们浇水了．
解答 答案：B
How long 对时间段提问；
How often多久一次，对频率提问；
How soon 多久，对将要用多长时间提问；
How much多少，对价格提问．
根据Do you water them？可知这是一般现在时，应该是：问他给花浇水的频率，多久一次，故选：B．
点评 主要考查特殊疑问句的疑问词组，做此类题目，一定注意句意，根据上下文推测所要问的内容，然后选出所需要的疑问词或疑问词组．本题主要考查How often多久一次，对频率提问！
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