选择题：48. The book proved to be very reliable and so was

题目内容：

48. The book proved to be very reliable and so was very ( ) to him in his research.(本题2.0分)
A、 useless
B、 invaluable
C、 negligible
D、 precious

参考答案：

29. If you want to get the driver’s _____, you sho

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操作提示：正确选“T”，错误选“F”。1. Human resources supported the proposal of giving the busin