问题补充：
It seems that his health is ( ).A.as poor,if not poorer than,his sisterB.as poor as,if not poorer than,his sister’sC.poor as his sister if not poorerD.poor,if not poorer than his sister’s这一题是选D吗?
答案：
选折B看起来,如果他的身体不比他妹妹差的话,也和他妹妹一样的不好.
因为需要比较,前后必须用比较的形式,只能是A B
但A的形式不对,正确的应该是as + 形容词或副词原形 +as 所以选B
======以下答案可供参考======
供参考答案1:
B.as poor as, if not poorer than, his sister’s
供参考答案2:
B供参考答案3:
B首先比较各个选项，看看句子本身想表达什么意思，然后根据语法和语境选出最佳答案
供参考答案4:
B.因为后面是比较级，所以前面用同级比较。
供参考答案5:
B 在as poor as his sisters 之间插入了一个if引导的条件句，同时又用力省略句，本来是as poor as his sister’s,if his health is not poorer than his sister’s的省略句
供参考答案6:
b
