is not possible that Bob can win the first prize in the competition.A. ThisB. ThatC. ItD.

问题补充：

is not possible that Bob can win the first prize in the competition.

A. This

B. That

C. It

D. What

答案：

A. This

B. That

(答案→)C. It

D. What

解析：本题考查强调句型中it用法。本句中it指代下文that Bob can win the first prize in the competition.从句内容做形式主语，其它选项无此用法。故选C。