题文
Yutu, China’s first moon rover(月球车), ________ at the center of attention since it flew to space last December.
| A．was | B．would be |
| C．has been | D．had been |
Yutu, China’s first moon rover(月球车), ________ at the center of attention since it flew to space last December.
| A．was | B．would be |
| C．has been | D．had been |
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