79. Before there goes the bell for class, our math teacher took out a piece of and wrote his problems on the blackboard.
| A．brush pen | B．chalk | C．paper | D．Pencil |
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79. Before there goes the bell for class, our math teacher took out a piece of and wrote his problems on the blackboard.
| A．brush pen | B．chalk | C．paper | D．Pencil |
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