As a saying goes, the wise man knows he knows nothing, _________ the fool thinks he knows all.
A．whenB．whileC．a(chǎn)sD．though
B

試題分析：考查連詞：A. when當…時候，B. while當,..時候，雖然，然而，C. as 因為，隨著，正如，D. though雖然，句意：俗話說，明者知自之不知，愚者自認無所不知。這里while表示對比，選B。
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