We are afraid that we have to charge more for the designated packing, as it ( ) extra labor and cost.<br />A. calls on <br>B.calls off<br>C.calls in<br>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：国家开放大学英语语法

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