举一反三
- In 1917, The U.S.Rubber Company invented sneakers.
- If computers ______, many problems on space flight could not have been solved. A: had not been invented B: are not invented C: were not invented D: have not invented
- 57. James watt ____ the steam engine. A: was inventing B: invented C: had invented D: has invented
- When was the first bicycle invented The first bicycle was invented .
- An American_______the bicycle. A: is invented B: invented C: invents
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---Football______by the British at the beginning of last century. ---That’s probably why football is one of________popular games in England. A: was invented, the most B: invented, more C: was invented, more D: invented, the most
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Where did the concept of feedback come from? A: It was invented by Confucius B: It was invented by Aristotle C: It was invented in World War 2 while working on anti aircraft guns D: It was invented to catch fish E: It was invented very recently in Alibaba’s research centre
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It is common knowledge that black tea in China more than 600 years ago. A: is invented B: was invented C: invents D: invented
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1917
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It's common knowledge that black tea ______ in China more than 600 years ago. A: is invented B: was invented C: invents D: invented