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

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

A．before           B．since             C．until             D．that

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

A. before             B. since             C. until               D. that

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

1. A.
   before
2. B.
   since
3. C.
   until
4. D.
   that

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

A. before             B. since             C. until               D. that