题文
The new plane will __________ a series of test flights before it is put into use.
| A．go off | B．go down |
| C．go through | D．go up |
推荐试卷
The new plane will __________ a series of test flights before it is put into use.
| A．go off | B．go down |
| C．go through | D．go up |
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