互为替代品的两种商品，一种价格越高，另一种的需求量越高 [ ]_爱下问搜题

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问题判断题

互为替代品的两种商品，一种价格越高，另一种的需求量越高 [ ]

答案

√

选择题

Mary said it was at least five years since he ______ a good drink.

A．enjoyed

B．was enjoying

C．had enjoyed

D．would enjoy

判断题

温度升高，油品密度增大。