It is said that potato chips by mistake about a hundred years ago.[
题型：同步题难度：来源：
| It is said that potato chips by mistake about a hundred years ago. |
| [ ] |
A. invent
B. invented
C. are invented
D. were invented |
答案
| D |
举一反三
—Have you ever been to Shanghai, Mary?
—Yes. I _________ there for three days with my parents last month.. |
| [ ] |
A. have gone
B. have been
C. went
D. was |
—Mike，you"ve got so many beautiful stamps.
—Yeah. I _______ collect stamps when I was 8 years old. |
| [ ] |
A. was used to
B. used to
C. am used to
D. used |
—Do you know when the 29th Olympic Games _______?
—Yes, in 2008. |
| [ ] |
A. hold
B. is held
C. was held
D. was holding |
| My math teacher ________ me, because he ________ I failed my test. |
| [ ] |
A. is angry for, find out
B. was angry with, found out
C. is angry with, find out
D. was angry with, find in |
| The dinosaurs _____about 65 million years ago. |
| [ ] |
A. were disappeared
B. disappeared
C. disappear
D. was disappeared |
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