28. (单选题) The book proved to be very reliable and so was very ( ) to him in his research.(本题1.0分) A、 useless B、 invaluable C、 negligible D、 precious

28. (单选题) The book proved to be very reliable and so was very ( ) to him in his research.(本题1.0分)
A、 useless
B、 invaluable
C、 negligible
D、 precious

出自：河南城建学院大学英语四

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