问题
选择题
228. Oh, the classroom is so dirty. It needs ______ before we begin our class.
A．cleaned
B．being cleaned
C．to clean
D．Cleaning
答案
答案：D
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228. Oh, the classroom is so dirty. It needs ______ before we begin our class.
A．cleaned
B．being cleaned
C．to clean
D．Cleaning
答案：D