Diabetes is now the nation’s third ______ health problem, after cancer and heart disease.

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问题 Diabetes is now the nation’s third ______ health problem, after cancer and heart disease.

选项 A、significant
B、more significant
C、most significantly
D、most significant

答案D

解析 最高级惯用型<the+序数+最高级>(第几个最……)
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