题目内容
Students are supposed to ______ the blackboard before ______ the next class.
A. clean the chalk, began B. clean the chalk off, began
C. clean the chalk off, beginning D. clean the chalk off, begun
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题目内容
Students are supposed to ______ the blackboard before ______ the next class.
A. clean the chalk, began B. clean the chalk off, began
C. clean the chalk off, beginning D. clean the chalk off, begun