题目

How does Jack usually go to work?He ______ drive a car, but now he ______ there to lose weight.A. used to; is used to walk B. was used to; is used to walkingC. was used to; is used to walk D. used to; is used to walking 答案：【答案】D【解析】句意：--杰克通常怎样去上班？--他过去常常开车去，但现在为了减肥他习惯于步行去上班。used to do 表示过去常常干某事，后跟动词原形；be used to doing 表示习惯干某事，后跟动名词形式；be used to do表示被用来做某事；而答语意为“他过去常常开车，现在习惯于步行来减肥”，故答案下图是(　　)角．从P点分别向角的两边作垂线．