I couldn't follow what he said ______,but atlasti understand.I couldn't follow what he said ______,but atlasti understand.A for the first B at first C the first D at the first

I couldn't follow what he said ______,but atlasti understand.I couldn't follow what he said ______,but atlasti understand.A for the first B at first C the first D at the first
I couldn't follow what he said ______,but atlasti understand.
I couldn't follow what he said ______,but atlasti understand.
A for the first B at first C the first D at the first

I couldn't follow what he said ______,but atlasti understand.I couldn't follow what he said ______,but atlasti understand.A for the first B at first C the first D at the first
B 固定短语,起初,开始.