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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 casual
参考答案
参考解析
解析：
句意：上周我们楼里新安装了一个热水锅炉，可以给学生们提供热水。be placed in service安装投入使用。inspect carefully仔细调查。undertake with care谨慎行事。undo casually随意地解开。
句意：上周我们楼里新安装了一个热水锅炉，可以给学生们提供热水。be placed in service安装投入使用。inspect carefully仔细调查。undertake with care谨慎行事。undo casually随意地解开。
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