30.Little__ that we were watching his every move, so he seemed to be going his own way in this business.
| A．he realized | B．he didn’t realize | C．did he realize | D．didn’t he realize |
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The companies are working together to createthey hope will be the best means o
f transport in the 21st century.
| A．which | B．that | C．what | D．who |
The hotel wasn’t particularly good. But I ____ in many worse hotels.
A .was staying B, stayed C. would stay D. had stayed
Scientists are trying to develop a special material, _______ they will make use of in space.
| A．it | B．that | C．what | D．one |
The education of _______young is always _______ hot and serious topic in modern society.
| A．the; / | B．a; the | C．/; the | D．the; a |
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