The bridge ___________________ (be built) by the time you come back
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The patient___________(be) in hospital for two days.
There_______(be) even greater changes in the coming ten years.
The watches __________( produce) a year ago
成本性态分析中的高低点法，在选择高低点坐标时，应以（ ）为标准
A. 业务量
B. 成本
C. 业务量与成本皆可
D. 不一定
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