In ____late 19th century, computers changed _____great deal and were widely used______international trade.  
A．the; a; theB．the; the;不填C．the; a; anD．the; a; 不填
D
在序數(shù)詞前用定冠詞the;  a great deal為固定短語, 意思為 “大量地”；
international trade表示泛指概念，不用冠詞。
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