单项选择题

W: I don’t think the job has to be done perfectly.
M: Maybe, but it’s important to do your best.
W: Yes, maybe you are right.
M: Just do your best.

What does the man mean().

A. Nobody can be the best.
B. Do as well as you can.
C. It’s difficult to do something important.
D. It’s impossible to do something important.

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