你是想问 it has 能不能缩写成it's 可以的,当处于现在完成时态和现在完成进行时态的时候都可以.比如：He's lost his keys 他掉了钥匙 She's been up to her study recently.她最近一直忙于学业.不管是书写还是口语,都是可以的.
祝开心~!