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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单项选择题
His grandmother brought him up, because his parents ______ when he was only one year old.
A．passed away
B．passed out
C．passed off
D．passed over
单项选择题
It was in that small village ______ our president was born.
A．which
B．when
C．that
D．as
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