A. began
B. had begun
C. have begun
D. will begin
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart
[单选题]Shopping habits in the United States have changed greatly in the last quart