--- 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 |