It that he has been ill for a long time. A. seemB. seemsC. lookD. looks

问题补充：

It that he has been ill for a long time.

A. seem

B. seems

C. look

D. looks

答案：

A. seem

(答案→)B. seems

C. look

D. looks

解析：句意是：看起来他病了很长时间了。Seem看起来，仿佛有固定句式 It seem that +从句；look看。 根据句式可知C和D是错误的，由于主语是第三人称单数，所以答案是B。