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单选题
How dirty the tables are! They need _____.
A
to clean
B
clean
C
cleaning
D
cleaned
参考答案
参考解析
解析：
句意：桌子实在是太脏了！它们需要被擦干净。need doing等于need to be done，主动表示被动。
句意：桌子实在是太脏了！它们需要被擦干净。need doing等于need to be done，主动表示被动。
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