will be good to a senior student to do a part time job—they will know more about society.A

问题补充：

will be good to a senior student to do a part time job—they will know more about society.

A. They

B. That

C. It

D. As

答案：

A. They

B. That

(答案→)C. It

D. As

解析：It为形主语，真正主语为不定to do a parttime job。句意为：高中生做兼

职有好处—他们可以更多地了解社会。