Since then, finding ways to grow more peanuts ______ his life goal.
A．has beenB．wereC．wasD．have been
A
考查時(shí)態(tài)。句意：從那時(shí)起，找到種植更多花生的方法已經(jīng)是他的人生目標(biāo)。根據(jù)時(shí)間Since then，可知用現(xiàn)在完成時(shí)態(tài)，還有動(dòng)名詞做主語謂語動(dòng)詞用單數(shù)。故選A。
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