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题目内容
（东北农业大学大学英语Ⅲ）
They ____ that the aging population is adding 1 per cent yearly to health service costs.
A、add
B、calculate
C、add to
D、calculate on
参考答案
They ____ that the aging population is adding 1 per cent yearly to health service costs.
A、add
B、calculate
C、add to
D、calculate on