单项选择题

In an old bookstore, you often ______ the early editions of many valuable books.

A．come across
B．come about
C．come with
D．come on
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单项选择题
What did Marry Dettling mean when she said It's going to be big
A．Green buildings will be larger in size.
B．People expect bigger green buildings.
C．Green buildings have a great potential.
D．People prefer to live in bigger buildings.
单项选择题
Could you meet me at the airport- I'd like to, but I ______ Shanghai when you return.
A．will have left
B．was leaving
C．will leave
D．have left
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