How time flies! It has been ten years I moved to Chongqing.A. whenB. thatC. beforeD. since

问题补充：

How time flies! It has been ten years I moved to Chongqing.

A. when

B. that

C. before

D. since

答案：

A. when

B. that

C. before

D. since

解析：考查固定句型。固定句型：it is/has been 一段时间since从句（过去时）；自从…以来，已经有一段时间了。句意：时间真是太快了！自从我来重庆已经了。故D正确。