问题补充：
The camera is too expensive .
A. for him to buy it
B. so that he couldn’t buy it
C. so that he can’t buy
D. for him to buy
答案：
A. for him to buy it
B. so that he couldn’t buy it
C. so that he can’t buy
(答案→)D. for him to buy
解析：句意：这个相机太贵了，对他来说买不起。too…to…意为“太…而不能…”，为一固定句型，后面不需要再加it，本句还可以用so…that…句型来表示，形式应该是The camera is so expensive that he couldn’t buy it.；故选D。
