we have to ____ everyone _____that keeping our city clean is our duty.

题目

we have to ____ everyone _____that keeping our city clean is our duty.
a.let;to know b.make;understand c.make;to understand d.have;to know
选哪个 为什么?

答案

选B
make sb do sth
意思就是我们必须要让每个人明白保持城市整洁是我们的责任