解释下列成语的含义。

高谈阔论：_____________________________

运筹全局：_____________________________

自欺欺人：_____________________________

博学多闻：_____________________________

There are altogether fifty-four students in our class, _____ is a new comer from a faraway

mountain village.

A．the most diligent of who

B．but the most diligent of whom

C．the most diligent of them

D．of whom the most diligent