He's already left for Beijing.改为否定句He_____ _____for Beijing ____.
问题描述:
He's already left for Beijing.改为否定句He_____ _____for Beijing ____.
它们以什么为食?What do they ____ ____?
答
He hasn't left for Beijing yet.
He hasn't yet left for Beijing .
肯定句用already,否定句用yet
What do they live on?
live on sth以某物为食
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