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Modern machinery _______ been installed in this newly-built factory.
A、
has
B、
have
C、
is
D、
are
参考答案：（本答案仅供参考，请以官方发布为准。）
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A
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教务处理（微信）：13083065686
Modern machinery _______ been installed in this newly-built factory.
A、
has
B、
have
C、
is
D、
are
A