is important to know how to get on with others when you grow up.A. ThisB. ItC. HeD. She

问题补充：

is important to know how to get on with others when you grow up.

A. This

B. It

C. He

D. She

答案：

A. This

(答案→)B. It

C. He

D. She

解析：考查it 用法，此题中it 是形式主语，真正的主语是后面的不定式，句意：当你长大的时候知道如何和别人相处是很重要的。所以选B。