单项填空.从A.B.C.D四个选项中选出可以填入空白处的最佳选项 This is important book. It helped me a lot in old days. A. a; an B. an; the C. the; an D. /; the 题目和参考答案——青夏教育精英家教网—

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单项填空，从A、B、C、D四个选项中选出可以填入空白处的最佳选项

This is _______ important book. It helped me a lot in ________ old days.

A. a; an B. an; the C. the; an D. /; the

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