题文
Teachers should keep students _______ a distance, but not _______ the distance.
| A．at; in |
| B．in; in |
| C．at; at |
| D．in; at |
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Teachers should keep students _______ a distance, but not _______ the distance.
| A．at; in |
| B．in; in |
| C．at; at |
| D．in; at |
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