—This history book is of great value.—Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it,

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1. (2017九上·射阳期中) —This history book is of great value.
—Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it, however.

A . Nothing; unless B . Few; till C . Something; until D . Little; since

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