Lucy，what have you learnt from this history class？
Paper _____ first _____ about 2，000 years ago in China． （ ）
| A． |
is；invented |
B． |
was； invented |
| C． |
is； inventing |
D． |
was；inventing |
Lucy，what have you learnt from this history class？
Paper _____ first _____ about 2，000 years ago in China． （ ）
| A． |
is；invented |
B． |
was； invented |
| C． |
is； inventing |
D． |
was；inventing |
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