Question

______ is pretty difficult for me to learn science well. A. That B. This C. It D. Its

Answer 1

C，it是代词，指代to后面的内容

Answer 2

C
It is +形容词+for sb+to do sth

Answer 3

C

Answer 4

c

Answer 5

答案选C. It
It is +adj.+for sb+to do sth
固定句型