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.

1. since the past few years, the movement of goods and services across national boundaries have become

2. the movement of goods and services across national boundaries since the past few years became

3. the movement across national boundaries of goods and services over the past few years have become

4. over the past few years, the movement across national boundaries of goods and services are becoming

5. over the past few years, the movement of goods and services across national boundaries has become

Answer: E

请问，不考虑单复数，能选A吗？

还真没注意到。。谢谢！

“since”,和the past few years放在一起怪怪的，能这样用吗？

当然能！！！选都选了E了，怎么不能！

LZ，不要放太多的精力在这种无关痛痒的细节上面，而重点在于把握句子的整体！---这是我G老师说的，不好意思，借用一下！

言语重了一些，不好意思