题目内容
| The new term is coming. The students are busy _______ the classrooms. |
A. clean B. cleans C. to clean D. cleaning |
试题答案
D
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The new term is coming. The students are busy _______ the classrooms.
[ ]
A. clean
B. cleans
C. to clean
D. cleaning
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B. cleans
C. to clean
D. cleaning