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江苏省南京市白下区2011届高三二模英语试题
第一节：单项填空（共15小题；每小题1分，满分15分）
从四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
A. what it is B. what it does
C. what is it D. why is it
第一节：单项填空（共15小题；每小题1分，满分15分）
从四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
A. what it is B. what it does
C. what is it D. why is it
