问题

hole process for the studies of cancer took morethan a year, the technology is moving so fast that it will soon take just weeks

A:having left
B:to leave
C:left
D:leaving

正确答案是：

同类题型

, John. This is Alice. I’m calling from work.How’s your mother feeling—________. Mum is out of hospital, but she has to stayin bed a few more days.

Miss Liu gave us _________ about how to learn English .

_______ we got to the station, the train had left already

下列各句中加点词的解释不完全正确的一项是（）

He is ill. I don’t know _______ he will come to school.