单选题
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
【正确答案】
B
【答案解析】
inspect carefully仔细调查；be placed in service安装投入使用；undertake with care谨慎行事；undo casually随意地解开。因为installed意为“安装”，故选B项。
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