题文
The students handed in their test papers to their teacher ______.
| A.one after one |
| B.one after another |
| C.1ittle by little |
| D.step by step |
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The students handed in their test papers to their teacher ______.
| A.one after one |
| B.one after another |
| C.1ittle by little |
| D.step by step |
试题篮
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