We have produced twice as much steel this year____4 years ago.A、than we didB、as

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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。

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Wehaveproducedtwiceasmuchsteelthisyear______4yearsago.A、thanwedid