Happiness --A--in her grandfather 's eyes every time he hear

Happiness __A__in her grandfather 's eyes every time he hears her voice.
A.shines B.is shone C.has shone D.was shone.
---Jack ,I haven't seen you these days.
---I __A__for the coming English test.
A.am studying B.have studied C.was studyingD.had studied
分析要详细,语法点要讲清楚.我给出的答案是对的.
一楼到三楼的解释都比较牵强,没有讲到重点,语法知识模糊.很容易就被推翻.
第二个我也认为是选C,可是答案是A.