【Esther Chen】評論
Format : need not + verb (不用加 to), need not have done something
【Kaoru Mei】評論
對阿~ 和過去事實相反....
【吳一零】評論
這題不需要用到假設語氣，而是need當助動詞，如果是need not have had worried，則變成有兩個p.p.，所以C是對的~:D