has后面加名词。has的例句Robert\'s collection of prints and paintings has been bought over the years（这些年来，罗伯特逐渐收藏了一批版画和绘画作品）。
has的`例句There has already been a definite improvement（已经有了显著的改进）；This is a clear demonstration of how technology has changed（这清楚地表明了技术已有了怎样的进步）。
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