摘要：When to compare the education system of China and Britain, the professor gave no answer. A. being asked B. asking C. asked D. to ask
网址：http://m.1010jiajiao.com/timu3_id_3149467[举报]
When ____ to compare the education system of China and Britain, the professor gave no answer．
| A．ask | B．asking | C．asked | D．to ask |