(单选题) The book proved to be very reliable and so was very ( ) to him in his research.(本题3.0分)
A、 useless
B、 invaluable
C、 negligible
D、 precious
出自：大连工业大学-大学英语4

提示：
同一【IP】的非会员用户每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10245403】个 (题库试题定时更新)