只有通过对该系统性能的研究，我们才能了解它的优点。

只有通过对该系统性能的研究，我们才能了解它的优点。

A.Only through study the performance of the system its advantages can be understood.

B.Only through the study of the performance of the system can we understand its advantages.

C.Only studying the performance of the system can one understand its advantages.

D.Only to study the performance of the system can one understand its advantages.

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