Bikes ______ in the 1880s and they ______ traveling around.
| A．were invented; were used as |
| B．were invented; are used for |
| C．was invented; was used for |
| D．invented; are used to |
Bikes ______ in the 1880s and they ______ traveling around.
| A．were invented; were used as |
| B．were invented; are used for |
| C．was invented; was used for |
| D．invented; are used to |
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