2. 外语
  3. We have produced twice as much steel this year______ 4 years ago.

We have produced twice as much steel this year______ 4 years ago.

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问题 We have produced twice as much steel this year______ 4 years ago.
选项 A、than we did
B、as we did
C、than we have produced
D、as we have produced
答案B
解析 如果句中出现形容词或副词的比较级,后面与之对应的是than；如果句中出现的是as和形容词或副词的原形，后面一定有另一个as与之对应，并且，后面as从句的时间状语是表示过去的，所以动词用一般过去时,故选B。
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