Question

In ____late 19th century, computers changed _____great deal and were widely used______international trade.  

A．the; a; the

B．the; the;不填

C．the; a; an

D．the; a; 不填

Answer 1

D

在序数词前用定冠词the;  a great deal为固定短语, 意思为 “大量地”；
international trade表示泛指概念，不用冠词。