I’m not sure whether I can gain any profit from the investment, so I can’t make a(n) ______ promise to help you. A.which B.where C. whether D.when

I’m not sure whether I can gain any profit from the investment, so I can’t make a(n) ______ promise to help you.
A.which
B.where
C. whether
D.when

出自：三门峡职业技术学院英语读写

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