英语17.John was so sleepy that he could hardly keep his eyes _______.17.John was so sleepy that he could hardly keep his eyes _______.a.open b.to be opened c.to open d.opening 为什么
问题描述：
英语17.John was so sleepy that he could hardly keep his eyes _______.
17.John was so sleepy that he could hardly keep his eyes _______.
a.open b.to be opened c.to open d.opening
为什么
答
答案是A，此处是用事态选项来迷惑人，确实有keep doing的形式，但这里是
keep+宾语+宾补，宾语补足语由形容词OPEN充当。
答
A
keep sth do ..........
答
opening可否作形容词， 将open看为动词，keep sth+现在分词，选D
答
open
答
选第三个.keep后面可以直接加doing便是一直做某件事情.这里面keep sth do的形式表示的是过去某个时候的动作,用doing则表示进行时或者一直怎么样.
答
a
keep sth. do
答
D,keep sth doing sth