题干


_________ the whole process for the studies of cancer took more than a year, the technology is moving so fast that it will soon take just weeks.

A:How

B:Because

C:If

D:While

上一题 下一题 0.0难度 选择题 更新时间:2017-08-15 11:03:42

答案(点此获取答案解析)

D