Statistics from the developed countries suggest that it is only when peoples living standa

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Statistics from the developed countries suggest that it is only when peoples living standards begin to rise______to fall.

A.can birth rate begin

B.that birth rate begins

C.that birth rate should begin

D.then birth rate begins

请帮忙给出正确答案和分析,谢谢!

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答案解析

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  • 正确答案:B
    这是一个itis…that…强调句结构,分析出这一点,就自然能找出正确选项了。考生切不可将句子看成是以only开头的要求倒装的结构而错选A;suggest在句中的意思是"表明",不是"建议",所以宾语从句中谓语不需要虚拟形式,因此C也是错的。