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
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单项选择题
Now that you are seriously ill, you'd better stop ______.
A．smoking
B．to smoke
C．smoke
单项选择题
Mary is from England. She teaches ______ English.
A．our
B．us
C．we
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