The abacus invented in the sixth century by Chinese people. A. be B. is C. was D. were——青夏教育精英家教网——

题目内容

The abacus _____ invented in the sixth century by Chinese people.

A. be
B. is
C. was
D. were

试题答案

C

相关题目

The abacus _____ invented in the sixth century by Chinese people.

A. be
B. is
C. was
D. were

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