Ducks' large feet_____them quickly through the water.A)used to push B)used to pushingA)used to push B)used to pushing C)are used to push D)are used to pushing

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Ducks' large feet_____them quickly through the water.A)used to push B)used to pushingA)used to push B)used to pushing C)are used to push D)are used to pushing
Ducks' large feet_____them quickly through the water.A)used to push B)used to pushing
A)used to push B)used to pushing C)are used to push D)are used to pushing

Ducks' large feet_____them quickly through the water.A)used to push B)used to pushingA)used to push B)used to pushing C)are used to push D)are used to pushing
C
be used to do sth 被用来干某事

仔细分析一下四个选项：
used to do sth:（过去）常常习惯做某事，现在已经不这样了。
没有used to doing 这种用法
C项就是标准的被动语态，用来干什么。
be used to doing:习惯于做某事（不一定是过去常常做的，现在可能也这样）

句子的意思是：鸭子的宽大脚掌常常用来推动自身的拨水前行（春江水暖鸭先知啊）。所以是...

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