题文
--- What do you think of the grammar book?
--- Oh, it really is ________ useful reference book, which is worth reading ________ second time.
| A．a; a | B．an; the | C．an; | D．the; the |
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--- What do you think of the grammar book?
--- Oh, it really is ________ useful reference book, which is worth reading ________ second time.
| A．a; a | B．an; the | C．an; | D．the; the |
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