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

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

出自：甘肃开放大学英语阅读1

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