问题

When ________ about one of the biggest concerns today, many people mention the sharp rise in prices[ ]
A: asking
B: to ask
C: having asked
D: asked
B: to ask
C: having asked
D: asked
正确答案是:
同类题型
Mother wanted to be a good provider, a role she ________ since her marriage to Father
Jack will go to Australia for further study tomorrow, so he ____ his luggage at present.
___________do you clean the goldfish’s tank–Three times a week.
I’ll tell Mary about her new job tomorrow. . — You ______ her last week. [ ]