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题目内容
（华南农业大学-大学英语1(高起专)）
But ____, the water in the area must be made clean.(本题5.0分)
A、 the most important thing
B、 of all the most important
C、 most important of all
D、 all the most important
A、 the most important thing
B、 of all the most important
C、 most important of all
D、 all the most important
参考答案