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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: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。

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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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