I don't think possible to master a foreign language without much memory work. A. thisB. t

问题补充：

I don think possible to master a foreign language without much memory work.

A. this

B. that

C. its

D. it

答案：

A. this

B. that

C. its

(答案→)D. it

解析：本题考查it的用法。正确答案为D项，it是形式宾语，真正的宾语是后面的不定式短语。而其它三项都没有此种用法。