Question

As a saying goes, the wise man knows he knows nothing, _________ the fool thinks he knows all.

A．when

B．while

C．as

D．though

Answer 1

B

试题分析：考查连词：A. when当…时候，B. while当,..时候，虽然，然而，C. as 因为，随着，正如，D. though虽然，句意：俗话说，明者知自之不知，愚者自认无所不知。这里while表示对比，选B。