In the midst of the activity, whatever it may be, people fall into step.
A、 No matter what actions they take, people are careful about each step.
B、 In the process of an activity, whatever it is, accurate timing is very important.
C、 No matter how complicated an activity is, people have to carry it on step by step.
D、 While engaged in the same activity, no matter what, people find they act like others.
【正确答案】：D
