B: Say to your friend (A) that the food in your canteen is actually not good at all. Tell him/her that you haven't had any sort of vegetable for years.
Try to use 并，好久。
其实我们食堂的菜并不好。我好久没吃到蔬菜了。
[Comments]
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Alternatively one can say 我们食堂的菜并不怎么样。