______is often the case with a new idea, many preliminary activities and optimistic discussions produced no concrete proposals.

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问题 ______is often the case with a new idea, many preliminary activities and optimistic discussions produced no concrete proposals.

选项 A、That
B、It
C、This
D、As

答案D

解析
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本试题收录于: 英语题库普高专升本分类
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