摘要：23．A．invents B．is invented C．was invented D．invented
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－When was the old car invented?
－I think the car ________ about one hundred years ago．
[ ]
A．invented
B．was invented
C．invents
D．is inventing
The mobile phone has influenced people's life a lot since it ________．
[ ]
A．invents
B．invented
C．is invented
D．was invented
The mobile phone has influenced people’s life a lot since it ______.
| A．invents | B．invented |
| C．is invented | D．was invented |