单项选择题

Since the introduction of the new technique, the production cost______greatly.

A. reduces
B. is reduced
C. is reducing
D. has been reduced
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The flower needs______.
A. to water
B. watered
C. watering
D. being watered
单项选择题
This is the small village______our president was born.
A. which
B. where
C. that
D. as
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