---I wonder you’ll water this kind of tree.--Once a week.A. how oftenB. how lo

问题补充：

------ 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. how often

B. how long

C. how soon

D. how much

解析：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。