By next year it_______necessary to double the production quota to keep up with market demands.

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问题 By next year it_______necessary to double the production quota to keep up with market demands.

选项 A、were
B、will be
C、has been
D、being

答案B

解析空格内应填入单数形式的谓语动词。这里不需要分辨主动语态和被动语态，只要考虑时态。时态在大部分情况下都是解题的提示。看到有next year，这是不是一个有力的提示?

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