The abacus was invented in the sixth century by Chinese people. 查看更多

 

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The abacus was invented ________ by Chinese people.


  1. A.
    in the sixth Century
  2. B.
    in the sixtieth Century
  3. C.
    in the sixteenth Century
  4. D.
    in the six Century

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The abacus _____ invented in the sixth century by Chinese people.
[     ]
A. be
B. is
C. was
D. were

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--When _____ the abacus _____?   -- In the sixth century by the Chinese people.

A.is, invented

B.did, invent

C.was, invented

D.does, invent

 

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请看下面表格,完成作文。
invention when who be used for
camera 1827 Joseph
Nicephore
Niepce
taking photos
abacus in the sixth century Chinese people counting
chips 1853 George Grum eating
例句: 
        Camera was invented by Joseph Nicephore. Niepce in 1827. It's used for taking pictures. There are
many great inventions in the world. Here is a short introduction.                                                           
                                                                                                                                                      
                                                                                                                                                      

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