题文
It is obvious to the students____ they should get well prepared for their future (2009•天津）
| A．as |
| B．which |
| C．whether |
| D．that |
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It is obvious to the students____ they should get well prepared for their future (2009•天津）
| A．as |
| B．which |
| C．whether |
| D．that |
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