The ruins of the ancient city ________ of great cultural value and should be preserved for research in the future. ( )(本题4.0分) A、 is B、 are C、 was D、 were

The ruins of the ancient city ________ of great cultural value and should be preserved for research in the future. ( )(本题4.0分)
A、 is
B、 are
C、 was
D、 were

出自：川北医学院-英语2

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