What is meant by trust in school?

• A、Freedom to express one' s views

• B、Extra effort teachers put into their work

• C、Independence of the teachers in schools.

• D、Unconscious and unspoken expectations.

你是王剛(Wang Gang)，寫一封給朋友李明(Li Ming)的祝賀信，祝賀他獲得復旦大學計算機科學碩士學位，并祝他今后在學習和研究方面取得成功。

Moviegoers know that many special effects are created by computers, __ they often don't know is that these scenes still require a lot of work.

• A、That

• B、Whom

• C、What

• D、How