His health is ______.
A、as poor if not poor than his sister
B、poor as his sister’s if not poor
C、as poor as if not poorer than his sister’s
D、as poor if not poorer than sister’s
【正确答案】：C
【题目解析】：省略句。其完整形式为：“If his health is not poorer than his sister's，his health is as poor as his sister's．”其中有些部分相同，故省略。
