Question

---________ have you studied in this school?
--- For about two years.

1. A.
   How often
2. B.
   How long
3. C.
   How much
4. D.
   How many

Answer 1

B
试题分析：How often多久一次；How long多长；How much多少钱；How many多少个。根据下文，大约两年。可知上文提问的是时间长短，故选B。
考点：疑问词辨析
点评：该题型是属于英语考试中的基础题型，是必考内容。答题前首先要理解每个选项的基本含义及用法，并注意交叉含义间的区别，然后根据答语，以及该疑问词在句子中承担的句子成分选择正确答案。