“Do you often swim now?”
“No, but I （ ）when I was in my fifties.”
A、
used to
B、
am used to it
C、
used to do
D、
was used to doing
【正确答案】：A
【题目解析】：
本题考查used的固定搭配。
used to 过去时常（而现在不再）做，符合句意。be used to doing 习惯做某事。
句意：“你经常游泳吗？“
“不经常游，但我五十多岁时常常游。”