单项选择题

Now that your plan seems to fail to work,you ought to make a（n） ____one as soon as possible.

A.alert
B.alarm
C.alter
D.alternative
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单项选择题
新设立的物业服务企业应当自领取营业执照之日起（ ）日内，持文件向工商注册所在地直辖市、设区的市的人民政府房地产主管部门申请资质。
A.10 
B.15
C.20 
D.30
单项选择题
To produce accurate results, the equipment must be manufactured to very ________ specifications.
A.deep
B.wide
C.key
D.high
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