Question

___ in the regulations is that you ___ other people the password of your e-mail account．    
A．What is required; not tell              B As is required; shouldn't tell
C．It is required; not tell                D．It requires; shouldn't tell

Answer 1

A

試題分析：句意：在制度中你所被要求的就是你不應(yīng)該告訴別人你的郵件密碼。what為所字機(jī)構(gòu)，作為主句的主語，即為主語從句，is之后為表語從句，句中有require要求，表語從句用虛擬語氣should +動(dòng)詞原形，should可以省略，故選A
點(diǎn)評(píng)：名詞性從句分為主語、賓語、表語、同位語從句四種，同位語從句和定語從句的區(qū)別在于：that作為關(guān)系代詞，可以引導(dǎo)定語從句，充當(dāng)句子成分，在從句中作賓語時(shí)可以省略； that引導(dǎo)同位語從句時(shí)，起連詞的作用，沒有實(shí)際意義，不充當(dāng)句子成分，一般不能省略。
試比較下面兩個(gè)例句:
I had no idea that you were here．（that引導(dǎo)同位語從句，不能省略）
Have you got the idea（that）this book gives you of life in ancient Greece？（that引導(dǎo)定語從句，作賓語，可以省略）