—Who washed the dishes on the table? — L_爱下问搜题

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问题选择题

— Who washed the dishes on the table?

— Lily . [ ]

A. was

B. did

C. had

D. would

答案

答案：B

单项选择题

（）the average age of the population increases, there are more and more old people to care for.

A. Unless

B. Until

C. As

D. While

问答题简答题

常用的节流调速回路有哪几种？