题目内容：
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
参考答案：
选择题：I’m not sure whether I can gain any profit from th
- 题目分类：三门峡职业技术学院英语读写
- 题目类型：选择题
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A.which
B.where
C. whether
D.when