What's the difference between 'fill up', 'fill out' and 'fill in'?
用法总结 Present continuous vs present simple 现在进行时和一般现在时 1. To talk about something that you are doing right now, use the present continuous tense. 描述 正在进行的动作，用 现在进行时。 I 'm drinking coffee. You 're ...
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