The students are ______ (confuse) about the ______ (confuse) problem.后面一个为什么加ing?
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![The students are ______ (confuse) about the ______ (confuse) problem.后面一个为什么加ing?](/uploads/image/z/11083610-2-0.jpg?t=The+students+are+______+%28confuse%29+about+the+______+%28confuse%29+problem.%E5%90%8E%E9%9D%A2%E4%B8%80%E4%B8%AA%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8A%A0ing%3F)
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