题目内容
根据句意从括号中选择正确的单词并填写在空白处。
Every morning, Simon sees the street sweepers ________(do, to do, doing)their job.
答案:doing
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题目内容
根据句意从括号中选择正确的单词并填写在空白处。
Every morning, Simon sees the street sweepers ________(do, to do, doing)their job.