Until recently, trade flows were of interest mainly to economic experts and executives of large corporations, but since the past few years, the movement of goods and services across national boundaries have become the subject of intense public attention all over the world.
A. since the past few years, the movement of goods and services across national boundaries have become
B. the movement of goods and services across national boundaries since the past few years became
C. the movement across national boundaries of goods and services over the past few years have become
D. over the past few years, the movement across national boundaries of goods and services are becoming
E. over the past few years, the movement of goods and services across national boundaries has become
OA:[spoiler]A
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A. since the past few years, the movement of goods and services across national boundaries have become
B. the movement of goods and services across national boundaries since the past few years became
C. the movement across national boundaries of goods and services over the past few years have become
D. over the past few years, the movement across national boundaries of goods and services are becoming
E. over the past few years, the movement of goods and services across national boundaries has become
OA:[spoiler]A
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