During the last few years，it has been realized that maintenance of programs is more expensive than development,so reading of programs by humans is as important as (73) them.(73)

A．editing

B．writed

C．written

D．writing

[单选题]D．uring the last few years ,it has been realized that maintenance of programs is more expensive than development, so reading of programs by humans is as important as(73)them.A．editingB．writedC．writtenD．writing

[单选题]D．uring the last few years, it has been realized that maintenance of programs is more expensive than development, so reading of programs by humans is as important as(67)them.A．editingB．writedC．writtenD．writing

[单选题]Television commercials have been under constant scrutinyfor the last few ye

[单选题]She has been working hard day and night during these years ______ she could

[试题]It has been documented that during World War Ⅱ, America's armed forces once tried formation flight to save fuel.

[问答题]()He has been learning English for years.

[问答题]He has been learning English for years.

[问答题]He has been learning English for years.

[单选题]During the pastten years there have been [dramatic] changes in the internat

[单选题]During the pastten years there have been [dramatic] changes in the internat