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一道单选,说明理由!Bamboo and silk _____making kites.A uesd forB are

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一道单选,说明理由!
Bamboo and silk _____making kites.
A uesd for
B are uesd to
C are uesd for
D uesd to
一道单选,说明理由!Bamboo and silk _____making kites.A uesd forB are
选C
A uesd for 用于
people use bulb for seeing in the dark
B are uesd to
第一种用法 被用来
加do
bulb are uesd to help people see in the dark
第二种 习惯
+doing i'm used to staying up late 我习惯于熬夜
C are uesd for 被用来
+doing
bulb are uesd for helping people see in the dark
D uesd to
过去常常
+do
i used to stay up late 我过去常常熬夜