. --- This book by Tony Garrison is of great use for our course.
--- But I think his latest one is worth reading.
A. better
B. more
C. well
D. very
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解析：句意：被Tony Garrison写的这本书多我们的课程非常有用。但是我认为最新的一本更值得读。be well worth doing 非常值得读，well的比较级为better,所以选A。