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.


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

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

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

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

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

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考题讲解

题目分析：

略。

选项分析：

选项A：首先，since应改为over。介词since身后只能接时间点而不能接时间段。例如：
since 1989, since today 
over身后通常接时间段，例如：
over 3 days, over one month.
因此，由于the past few years是一个时间段，所以不能用since来连接。由于主语的核心词movement是一个单数名词，需将have改为has。

选项B：介词since错误同选项(A)；由于本句处在“到现在为止的”的状态中，所以需要把过去时became改为现在完成时have become。

选项C：主谓一致错误同选项(A)。另外，由于“商品和服务（goods and services）”是movement的逻辑宾语（此时movement显然是move的名词化结果，所以goods and services虽然在成分上是movement的定语，但在逻辑上，相当于move的逻辑宾语），所以需要将of goods and services直接紧挨着放在movement身后。（放在现在的位置上，由于就近修饰原则，会被误认为是修饰boundaries的）

选项D：时态错误同选项(B)。主谓一致错误同选项(A)。

选项E：Correct. 本选项在语法和逻辑上均是正确的。

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