单选题
Diabetes is now the nation's third ______ health problem, after cancer and heart disease.
(A) significant
(B) more significant
(C) most significantly
(D) most significant
A
B
C
D
【正确答案】
D
【答案解析】
[语法] 最高级惯用型＜the+序数+最高级＞(第几个最……)
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