The telephone ______ by Bell in 1876．（ ）
| A． |
will be invented |
B． |
is invented |
| C． |
was inventing |
D． |
was invented |
The telephone ______ by Bell in 1876．（ ）
| A． |
will be invented |
B． |
is invented |
| C． |
was inventing |
D． |
was invented |
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