单项选择题

So much have we achieved, so much more ______.

A. is there to achieve
B. there is to achieve
C. be there to achieve
D. there should be to achieve

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单项选择题

We all collect books in vast numbers, often ______ for years.

A. left them not to read
B. leaving them unread
C. left them to be unread
D. leaving them being unread

单项选择题

For the first time in classical ______ the nuclear family had assumed a central role in the politics of state.

A. antiquity
B. ancestry
C. archeology
D. primitiveness

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