Piaget 30 to establish a body of psychology all his life and became a very influential figure in educational psychology.
答案：(C) sought
seek to V 意為「設法、致力於做某事」，sought 是 seek 的過去式：皮亞傑終其一生致力於建立一套心理學體系；forgot（忘記）、afforded（負擔得起）、tended（傾向於）語意都不合。
答對率 13%，代表高分群與低分群一起猜。
最容易選的是 tended——tend to V（傾向於）是課本操練最多的句型，眼熟到你看到 to V 就直覺套上去，沒有回頭看語意合不合。但「傾向於建立一套心理學體系」語氣太弱，與後半句 became a very influential figure in educational psychology（成為教育心理學極具影響力的人物）搭不起來。
seek 的意思是「尋求、追求」，接不定詞時 seek to V 表示「設法、致力於」，語氣積極而持續。本句 Piaget sought to establish a body of psychology all his life 就是「皮亞傑終其一生致力於建立一套心理學體系」——all his life（終其一生）正是這個語氣的佐證。
seek 的三態是 seek-sought-sought，與 buy-bought-bought、bring-brought-brought、think-thought-thought、fight-fought-fought 同屬 -ought 家族。你如果不熟這個變化，看到 sought 可能根本認不出是 seek。
forget to V 是「忘記要做某事」；afford 要說 afford to V（負擔得起），且通常與金錢或時間搭配；tended 如前所述語氣太弱。
seek to V（設法、致力於）、seek help／advice（尋求協助／建議）、much sought-after（炙手可熱的）、hide-and-seek（捉迷藏）、tend to V（傾向於）。
Jean Piaget, a psychologist and pioneer in the study of child intelligence, was born in Switzerland in 1896. At age 10, he managed his first 26, a description of a partly albino sparrow he observed in a public park. At age 15, he 27 to devote his life to developing a biological explanation of knowledge.
He began his career as a zoologist, 28 mollusks and their adaptations to their environment. 29 age 21, he had already published 25 professional papers on that topic.
Later, after working with Alfred Binet in Paris, he became interested in levels of logic used by children taking standardized tests on intelligence. Piaget 30 to establish a body of psychology all his life and became a very influential figure in educational psychology. His works were all written originally in French and were later translated into English.