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take turns是動詞片語，by turns 是副詞片語 

1.都是輪流的意思時，可交換使用： 
Joy and her sister take turns helping their mother each night. 
= Joy and her sister help their mother by turns each night.
每晚喬依和她的姊姊輪流幫助她們的母親 

2. 當指行為輪替地做某些動作時, 習慣用 by turns 避免意思混淆： 
They laughed and cried by turns. 他們笑一陣哭一陣 
The boy went hot and cold by turns.這男孩一陣發熱一陣發冷 

原出處：奇摩知識+

(考片語)

My elder sister and I ________ turns washing the dishes.  

(我姊姊和我輪流洗碗盤。)

(A) take 

(B) keep 

(C) on 

(D) at 

這裡考 [片語] take turn 輪流。

其餘 (B)(C)(D)都沒有這種用法。