—Isyourmotherstillateacher?—

來源：國語幫 7.98K

— Is your mother still a teacher?

A. Yes, she was B. She didn’t use to

C. No, but she used to D. No, but she used to be

D。used to be表示“曾經是……”，與現在有對比之意。to後的be要保留。