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一道SAT语法题.为什么选C?我觉得这里they指代的很清楚啊,直接指代nuthatches.

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一道SAT语法题.为什么选C?我觉得这里they指代的很清楚啊,直接指代nuthatches.
Among birds (A.that forage) in tree trunks,nuthatches are the only ones that( B.regularly feed) with theirheads facing downward,(C.when they often find )food in bark crevices (D.overlooked) in their upward search.(E.No error)
一道SAT语法题.为什么选C?我觉得这里they指代的很清楚啊,直接指代nuthatches.
我觉得C答案的often 有问题,often是频度副词,意为“经常,时常”,表示反复性的动作或状态,而when 引导了一个时间状语从句,从句中的动作不需要强调它反复发生,一般需要强调的是主句的动作发生的频度,表示从句动作发生时或从句表示的状态下,主句动作也会发生的频率比较高,比如:
Young people are often unhappy when they are with their parents.
He would often tell me interesting story when I was a child.
He often follows me when I go shopping.
总之,我没见过ofen 放在when从句里,这只是我个人的理解,听你说的,好像是they 的问题,这个我也觉得他指代的很清楚了,真的是指代不明的话,也只能说是与birds 发生了歧义,如果答案不对,欢迎提出!