单项选择题

The building was completed two months ahead of time, ______ is something we had not expected.

A．it
B．that
C．which
D．what
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单项选择题
If you read a book word by word, you often fail to get the main idea of what you're reading and soon forget what you ______.
A．are reading
B．were reading
C．have been reading
D．had reading
单项选择题
I quickly answered your letter, for, if I delayed, you ______ I was not concerned about your difficulties.
A．had thought
B．thought
C．would think
D．were thinking
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