Only when you stay with local people for a period of time will you have better understan

Only when you stay with local people for a period of time will you have better understanding of life there.
A. a; a
B. the; a
C. the; the
D. a; the

A. a; a(答案→)B. the; aC. the; theD. a; the解析：这题考查冠词的用法：第一空填the表示特指“当地人”，第二空填a,是词组：have a better understanding of“对某事有更好的理解。选B。

我明天再问问老师，叫他解释下这个问题