When we have a dictation of useful expressions ,__ ,our teacher speaks very fast.Later on,he tells us the Chinese meanin
问题描述：
When we have a dictation of useful expressions ,__ ,our teacher speaks very fast.Later on,he tells us the Chinese meaning.A to tell the truth B to begin with C first of all D by the way.请说明原因
答
C
句意是：当我们听写短语的时候,一开始,我们的老师说得很慢,然后他告诉我们汉语意思.
由later on “稍后” 推断出first of all “开始”.