2. 外语
  3. At the later stage of development, there ______ new problems which first seemed insoluble.

At the later stage of development, there ______ new problems which first seemed insoluble.

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问题 At the later stage of development, there ______ new problems which first seemed insoluble.
选项 A、rose
B、arose
C、resulted
D、happened
答案B
解析 这里单词arise表示“产生了；出现了”。
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