I was so tired that i couldn't keep my eyes ______.A.opening

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I was so tired that i couldn't keep my eyes ______.A.opening B.open C.opened D.to open.
为何选B而不是选A?
我知道是keep sth + adj,但是A怎么解释不行呢?
不是keep me waiting吗?

是这样的,wait本身是一个“持续动词”,就是说wait（等待）这个动作是可以持续一段时间的,所以keep me waiting说得通的.但是open 就不同,“open”这个动作是一瞬间的,例如你打开门或者张开眼睛都是短时间内的动作,所以不能用opening表示这个动作的持续,而只能用形容词open表示这种状态的持续.

50.I was so tired that I couldn't keep my eyes _____ I was so tired that () I closed my eyes,I fall asleep.A for it was so cold that i couldn't feel my 填空)根据给出的首位字母写出单词1.I was so tired;I couldn'tkeep my eyes o___ “i couldn't believe my eyes!the car was upside I was so ______ moved by his words that I couldn’t fall asle 请问I was so ______ moved by his words that I couldn’t fall as I was so frightened that I couldn‘t say a word.=I was_______ 改错句“I was so exciting that I couldn't say a word” Hen was so tired that he could ( ) keep his eyes open.A、ever "I were so tired that I couldn't stand up."这句话怎么改成简单句? ——that I couldn’t be absorbed in the work.A.It was so noisy