A word processing program is a kind of ______ that many people use to write with.

A．Addition. subtraction, multiplication and division are the most important feature of accounting software.
B．Business people often use personal computers to work out complicated problems with the aid of accounting programs.
C．Business people use the accounting software because it is complicated but inexpensive.
D．An accounting program is a set of instructions that tells a personal computer merely to favour business people.

A．are to repair
B．will repair
C．have repaired
D．will have repaired