應(yīng)該是was used to do就是use的被動語態(tài)（此為過去時,原型為be used to do)
例：The pens are used to write.
(We use pens to write.)
was use to doing意為習(xí)慣于做什么（此為過去時,原型為is used to being）
例：I used to drinking milk in the morning.
另外還有一個used to do,意思是過去常常...
例：I used to smoke.