I used to _______ on electricity, but I've switched to gas. A. cook B. cooking C. cooked D. cooks
Mary: How about going to dinner at Pizza Hut tonight?Jean: ___________
A. Forget it.
B. Sorry,I like pizza.
C. That’s great!
D. Glad you like it

I used to _______ on electricity, but I've switched to gas.
A. cook
B. cooking
C. cooked
D. cooks

请会的帮下忙,谢谢!