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20、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

20、A

解析：這一題考了定語從句的用法。第二個句子作為定語從句修飾前面句子中的先行詞many difficulties，原句可以看成 “ How teachers can effectively help individual students is not the least of many difficulties. ” 其他三個選項都是介詞，不能直接接句子。

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科目：高中英語 來源： 題型：

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

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