I can't use your pen there is no ink in it.A. forB. whenC. ifD. whether

问题补充：

I can use your pen, there is no ink in it.

A. for

B. when

C. if

D. whether

答案：

(答案→)A. for

B. when

C. if

D. whether

解析：可联系答.案.网客服索取。

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