With food prices keeping rising,the days are gone _ we could buy a good meal for under $5
问题描述：
With food prices keeping rising,the days are gone _ we could buy a good meal for under $5
A.which B.when C.whether D.where
答
B
引导定语从句,修饰先行词the days如何判断选用关系代词还是关系副词？把先行词代到定语从句中去，如果刚好吻合，就用关系代词； 如果缺一个介词，便用关系副词如：we could buy a good meal for under $5 【in】the days注意： the days 是先行词可见，缺一个介词in, 这时就不要用that, which, 而要用关系副词