摘要：80．小心! 句子:
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（翻译）此时过马路是很困难的，因此你必须小心。
It's hard _________ _________ the road at the moment,so you must __________ ___________.
查看习题详情和答案>>从所给的四个选项中选择最佳答案
—________ do you have to go and see the doctor?
—Once a week．
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A
．How soon B．How longC
．How much D．How often 查看习题详情和答案>>