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问题: 一些超级简单的英语题~~~

1.The key( )on the desk when I go out.
A.was left B.will be C.leaves D.has left
2.Our classroom must be made( )all the time.
A.clean B.to clean C.cleaning D.cleans
3.She didn't know( )to do with the car which broke down halfway.
A.when B.how C.what D.where
(请大家详细解释一下~~~谢谢各位拉~~~)

解答:

1.A “被忘在桌上”用被动!
2, A clean在这里做形容词,“干净的”!make sth clean“使....干净”
如果选B,all the time就讲不通了
3,C do....with.....处理,应付!what做do的宾语