They considered a computer which was considereda great help in their work．A. to buy; to b

问题补充：

They considered a computer, which was considereda great help in their work．

A. to buy; to be

B. buying; being

C. to buy; being

D. buying; to be

答案：

A. to buy; to be

B. buying; being

C. to buy; being

(答案→)D. buying; to be

解析：可联系答.案.网客服索取。