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几道英语选择题The building( ) to us is of great value.A.built B.bei

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几道英语选择题
The building( ) to us is of great value.
A.built B.being built C.to be built D.be built
I was deep in thought , so I didn't notice( )
A.him to come in B.him come in C.he come in D.him coming in
Hurry up!mother is sure ( ) us at home.
A.waiting B.to wait for C.to be waiting D.to be waiting for
( ),the boy could't enter his house
A.Since the key had lost
B.The key being lost
C.Lost the key
D.Having lost the key
请大家给我分析一下解题思路 谢谢了
C 待填词修饰building为被动用法,且一句中不可有两个动词,已有后面is为谓词,根据句意,要建的这个楼对我们来说有很大的价值
D 我当时在沉思,所以没有注意到他进来.他进来是一种状态,用ing形式
A 现在进行时
D 第一项A因果句,但如使用此句动词应是被动语态; B前后主语不一致,不可为一句; C两个都是单独的句子,只能是两句; D ing形式短语可作为并列句