How many lessons do you usually have a day?—Six lessons a day,and each of then____45 minutes

How many lessons do you usually have a day?—Six lessons a day,and each of then____45 minutes

题目
How many lessons do you usually have a day?—Six lessons a day,and each of then____45 minutes
A last B lasts C have D are 为什么要选B
答案
last是持续的意思,也就是一节课持续45分钟.然后each(每节课)要跟动词第三人称单数搭配,所以要加S
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