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 did
C、than we have produced
D、as we have produced
答案B
解析 本题考查的是比较句的用法。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，故选项B为正确答案。A项和C项都只能与形容词或副词比较级搭配，而不能与as much搭配。D项中的动词时态不适用于“…4 years ago”这个时间状语，故排除。
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