问题
选择题
------ I wonder ______ you’ll water this kind of tree.
------- Once a week.
A．how often
B．how long
C．how soon
D．how much
答案
答案：A
疑问词辨析。how often多久一次；how long多长；how soon多久；how much多少钱。根据下文once a week一周一次，可知上文提问频率，故选A。