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题目内容
（甘肃开放大学 英语阅读1）
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
A.
calls on
B.
calls off
C.
calls in
D.
calls for
参考答案