-How does Jack usually go to work? ---He drive a car but now he there to lose weight

问题补充：

---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 walking

C. was used to, is used to walk

D. used to, is used to walking

答案：

A. used to, is used to walk

B. was used to, is used to walking

C. was used to, is used to walk

(答案→)D. used to, is used to walking

解析：句意：——杰克通常怎样去上班？——他过去常常开车去，但是现在他为了减肥习惯步行去那。used to do sth.则表示过去常常，to后跟原形动词；be used to doing sth.表示习惯于做某事或习惯于某事，to是介词，后面要跟名词、代词或动名。故选D。