单项选择题

The first underground railway in Shanghai ______ in 1994.

A．was setted up
B．was set up
C．set up
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单项选择题
The book is ______ a great help to English learners.
A．thought (认为,考虑) to be
B．thinking
C．thinking to be
单项选择题
Now that you are seriously ill, you'd better stop ______.
A．smoking
B．to smoke
C．smoke
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