By the year 2000, production in the area is to double ______ of 1990.A、thatB、it

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问题 By the year 2000, production in the area is to double ______ of 1990.

选项 A、that
B、it
C、one
D、what

答案 A

解析 题型:语法题。that和one二者均可代替前文提到的人或物,在被替代成分后有介词短语修饰时,或被替代的成分为不可数名词时,用that。而在被替代成分前有形容词修饰时,则用one。
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