The boy will make a lot of trouble when_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

The boy will make a lot of trouble when __________ alone.

A．leaving

B．leave

C．left

D．being left

答案

答案：C

选择题

He will come ____ three days.

A．before

B．after

C．in

D．later

单项选择题

划分粒组的分界尺寸称为（）

A.有效粒径

B.界限粒径

C.颗粒级配

D.粒组