One of the biggest problems in food.

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One of the biggest problems in food.
One of the biggest problems in food production has always been that people have no reliable access to exact information,_____is often the case in China.
Athat Bwhat Cwhich Dit
为何要用which而不用it,请详细说明.

which 指代（One of the biggest problems in food production has always been that people have no reliable access to exact information）一长串的事实,是定语从句中的非限制定语从句类型,不可以用A,而选C,或者用as
用it没有先行词的指代了不可以,如果你想选D
我们来修改一下,变成名词性从句的同位语从句,It is often the case in China that one of the biggest problems in food production has always been that people have no reliable access to exact information

One of the biggest problems in food. I think p_____ is one of the biggest problems in the world. 英语翻译Flooding is one of the biggest problems on the world .In Blame is one of the biggest problems that we meet in everyda 求英语翻译,谢谢One of the biggest problems we are dealing with in h It could be one of the biggest environmental problems facing 英语听力,One of the biggest problems people have is honesty 高一英语填空题高一英语填空1.H( ) is one of the biggest problems in develo one of the biggest problems of our life today is pollution. 英语翻译 Flooding is one of the biggest problems on the world .I i think one of the biggest problems for me is language 中prob ____(hungry) is one of the world's biggest problems.怎么填?