单项选择题

A new water boiler was installed in our building last week, which could provide hot water to the students.

A．inspected carefully
B．placed in service
C．undertaken with care
D．undone casually
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单项选择题
There isn't sound proof to support his biological theory.
A．financing
B．publications
C．evidence
D．appreciation
单项选择题
Vast amounts of money are being invested in the local market.
A．Enormous
B．Constant
C．Unknown
D．Sufficient
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