单项选择题

Modern medicine has become a more exciting field of study as a result of tie two recent changes.

A．现代医学成为一个更令人振奋的研究领域的结果就是最近两个变化的发生。
B．现代医学使整个研究领域更为令人振奋，并同时引发了最近的两个变化。
C．由于最近发生的两个变化，现代医学使整个研究领域都更为令人振奋。
D．最近的两个变化使现代医学成为一个更令人振奋的研究领域。

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