We had quite many difficulties with our big-size classes, how teachers can effec

We had quite many difficulties with our big-size classes, ________ how teachers can effectively help individual students is not the least.

       A. of which                  B. including                  C. besides                     D. beyond

试题答案

A

解析：这一题考了定语从句的用法。第二个句子作为定语从句修饰前面句子中的先行词many difficulties，原句可以看成 “ How teachers can effectively help individual students is not the least of many difficulties. ” 其他三个选项都是介词，不能直接接句子。