题目内容：

it's a good habit to keep the classroom___all the time A cleanly B clearly C clear D clean

优质解答

选D
keep+宾语+形容词=保持……的状态

追问：

can you do me a favour?the box is___heavy for me___carry upstairs. A too,to B so,that C such that D so,as to 是选A吗，好了采纳

追答：

是的。 too…to=太……而不能