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3. ____is well-known， the earth moves around the sun.()

A. Which

B. What

C. As

D. It

【答案】C

【考點(diǎn)】考查as引導(dǎo)的非限制定語從句;

【解析】as和which在用法上有區(qū)別，which一般放句中，而as一般放句首，且有“正如……”之意。故本題選C。

4. The harder you work， ____.()

A. the more you learn

B. you learn the most

C. the most you learn

D. you learn the more

【答案】A

【考點(diǎn)】本題考查the 比較級。 ;

【解析】the 比較級，表示“越……越……”句子意思是“你越努力，得到的就越多?！惫时绢}答案選A。

5. Only then ____ that he had left his key on his office.()

A. he realized

B. did he realize

C. had he realized

D. he had realized

【答案】B

【考點(diǎn)】本題考查倒裝結(jié)構(gòu);

【解析】“only 狀語從句”位于句首，句子發(fā)生部分倒裝，即把助動(dòng)詞放在主語前面。then表示在過去，故用did。所以本題選B。