题目内容：

请教一道英语选择哈
2.The streets had been _____before the parade begun.
A swept clean B swept cleanly C sweeping thorough D sweeping thoroughly
..呵呵 但是我很自然的选择了B 该怎么解呢?

优质解答

sweep clean 就是个词组,整体是个名词,希望有用呵呵