单项选择题

The handbook is not an easy book to read, but one ______ is very useful to anyone who wants to understand the inner workings of this company.

(A) that
(B) who
(C) it
(D) how
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单项选择题
Bear in mind that no part of this book may be reproduced ______ written permission from the author.
(A) unless
(B) when
(C) without
(D) for
单项选择题
The World Bank is composed of five branches, each ______ its own budget and carrying out separate duties.
(A) having
(B) has
(C) to have
(D) is having
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