We are afraid that we have to charge more for the designated packing, as it _______ extra labor and cost. A.calls on B.calls off C.calls in D.calls for 答案:

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D. calls for。 A. calls on 号召，呼吁；B. calls off 取消；C. calls in 召集；D. calls for 需要，要求。句意：我们恐怕得为指定的包装多收费，因为它需要额外的劳动力和成本。故选D。