单选题
Robert: What are you doing?
Ellen: Trying to get this wine stain out of the carpet.
Robert: Hang on. There's some soda in here, It should take the stain right out.
Ellen: Really? Hey, ______.
A、
it really is functioning
B、
it really is working
C、
it really is playing
D、
it really is influencing
【正确答案】
B
【答案解析】
[注释] 表达某种方法、药物起作用或有效果时用work。这里的对话说的是“用苏打去除污渍真的管用”，用work很恰当。其余的表达不地道。
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