Many people begin to have health problems___.A:in their forties B:their fortieth birthday C:forty years old D:over forty如果选A的话为什么D不对呢?

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Many people begin to have health problems___.
A:in their forties B:their fortieth birthday C:forty years old D:over forty
如果选A的话为什么D不对呢?

A:in their forties
很多人在四十多岁的时候开始出现健康问题.

a,在他们四十多岁的时候

A 在他们四十多岁时

A in +年龄 在某个年龄时

D

A