为什么keep后面没跟ing1.Keep windows open to let fresh air in.为什么这个句子里Keep后的open没写成opening?2.填空 He seems ____(be) angry .What's the matter?

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为什么keep后面没跟ing
1.Keep windows open to let fresh air in.为什么这个句子里Keep后的open没写成opening?2.填空 He seems ____(be) angry .What's the matter?

keep sth.+形容词 把...保持在...状态
类似有:keep one's eyes open;keep one's eyes closed
to be