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My wound has been aching ever since ___.
(a) it has started to rain
(b) it begins to rain
(c) it has started raining
(d) it started to rain
因為是先下雨造成了他的傷口在痛
所以我們知道主要子句是用現在進行式,但下雨比較早發生
所以since 的子句則用過去式
答案選(D)
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