How long do you think it will be the computer company puts forward a new product?A. befor

问题补充：

How long do you think it will be the computer company puts forward a new product?

A. before

B. since

C. until

D. that

答案：

A. before

B. since

C. until

D. that

解析：考查固定句型：这是个固定的时间状语从句 it will be + 一段时间+ before sth. happens，do you think为插入语，可知此处应用陈述语气，排除B、C两项；此处不是强调句，可排除D；How long属于时间段，故选A。