第24题: [单项选择](If) the experiment succeeds or fails, it will (provide us with) (valuable) experience, which is essential to (improving) our future work. A. If B. provide us with C. valuable D. improving 参考答案:A 答案解析:应改为Whether。whether可以与or搭配,if 不可以,whether表“是否,不管”时可以置于句首。