单项选择题

If the experiment succeeds or fails, it will provide us with valuable experience, which is essential to improving our future work.

A．If
B．provide us with
C．valuable
D．improving
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单项选择题
Because of the severe snow storm and the road blocks, the air force dropped food and medical supplies close the city.
A．Because of
B．the
C．dropped food
D．close the city
单项选择题
John said his mother would buy him a five-speeds racing bicycle for his sixteenth birthday.
A．would buy him
B．five-speeds
C．for
D．sixteenth birthday
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