______ the beginning of the 19th century did scientists know that all matter is
题型：0108 期中题难度：来源：
| ______ the beginning of the 19th century did scientists know that all matter is made up of atoms. |
| [ ] |
A. At
B. By
C. Up to
D. Not until |
答案
| D |
举一反三
— What has Tom been doing recently?
— I don"t know, _____ care. |
A. nor do I
B. nor I do
C. neither am I
D. neither I am |
| Only when he failed the exam ______ that he didn"t work hard. |
A. he regretted
B. did he regret
C. had he regretted
D. does he regret |
| _____ I shouted at the top of my voice _____ turn his head. |
A. Not until; did he
B. Not until; he did
C. Until; he did not
D. Until; did he not |
| Only when the meeting began _____ that he had left his papers at his office. |
A. will he realize
B. he did realize
C. did he realize
D. should he realize |
— David has made great progress recently.
— ____, and ____. |
[ ] |
A. So he has, so you have
B. So he has, so have you
C. So has he, so have you
D. So has he, so you have |
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