题文
The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
| A．witnessed | B．has witnessed |
| C．is witnessing | D．witnesses |
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The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
| A．witnessed | B．has witnessed |
| C．is witnessing | D．witnesses |
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