题文
At first the experiment went on well, but ______ problems we hadn’t expected turned up later and it failed.
| A．outstanding |
| B．curious |
| C．powerful |
| D．various |
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At first the experiment went on well, but ______ problems we hadn’t expected turned up later and it failed.
| A．outstanding |
| B．curious |
| C．powerful |
| D．various |
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