（年安徽省合肥市高三第三次教学质量检测）21. Gottlieb Daimler, ______ German engineer, is normally believed to have invented ______ car.
| A．a; 不填 | B．a; the | C．the; a | D．不填; a |
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—Oh my god! You__ wear slippers to attend the conference．
—I'm sorry I forgot there is a conference．
| A．must | B．can | C．should | D．shall |
In this experiment, the famous professor showed three different____ to the study of physics．
| A．means | B．methods | C．ways | D．approaches |
_______the match is lost? We can fight again!
| A．Even though | B．What though | C．If though | D．As though |
These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on．
| A．would have been unthinkable | B．would not be unthinkable |
C．would be unthink able |
D．would not have been unthinkable |
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