A
指"互相幫助"each在動詞后邊，人稱代詞要用單數(shù)。這里是their，應(yīng)該排除有each的選項吧這不是單獨的each, 而是包含一個each 的相互代詞 each other
each other
互相, 彼此
We write to each other regularly.
我們彼此經(jīng)常通信。
They look at each other's faces.
他們望著彼此的臉。
each other 一般所指的范圍為"兩者"
再說此句的their 是相對主語The twins 來說的. 指"她們倆的"
The twins helped( )in their studies
The twins helped( )in their studies
A:each other B:one and the other C:one and another D:each and other
A:each other B:one and the other C:one and another D:each and other
英語人氣：870 ℃時間：2020-06-18 10:21:38
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