You should never base anything on a theory that _________ impractical in practice.  
A．is provedB．proveC．provesD．proved
C
考查時態(tài)和語態(tài)。句意：你不應當基于任何一個不切實際的理論。prove作"證明是;結(jié)果是;事實說明"解時,用作連系動詞，沒有被動語態(tài)。結(jié)合語義可知定語從句描述的是客觀存存在的事實，故用一般現(xiàn)在時態(tài)。邏輯主語a theory是單數(shù)，故謂語動詞用單數(shù)，選C。
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