单选题
According to the article, what does the word "concurrently"(Para. 4) mean?
A、
At the same time.
B、
One at a time.
C、
In order.
D、
Not currently.
【正确答案】
A
【答案解析】
concurrently同时发生地。选项A正确。
提交答案
关闭