2. 外语
  3. Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act of 1986.

Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act of 1986.

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问题 Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act of 1986.
选项 A、so many changes at once as they had in
B、at once as many changes as
C、at once as many changes that there were with
D、as many changes at once as they confronted in
E、so many changes at once that confronted them in
答案D
解析 C、E中缺少一个as；B中未补出比较对象，会产生歧义；A中than之后补出的谓语动词had的形式不对，应用did，因为as之后的动作是发生在1986年，属于过去时段，用一般过去时即可。
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