The World War II made impossible for Einstein to go on with his research. A. himB. itC. th

问题补充：

The World War II made impossible for Einstein to go on with his research.

A. him

B. it

C. this

D. that

答案：

A. him

(答案→)B. it

C. this

D. that

解析：考察it作为形式宾语。本句中的it是形式宾语，真正的宾语是后面的to go on with his research。句意：第二次世界大战让爱因斯坦的研究变得不可能。英语中只有it可以作为形式宾语。故B正确。