Mike's spoken English __a lot over the two years.
问题描述：
Mike's spoken English __a lot over the two years.
A.improves B.improved
C.has improved D.had improved
答
选C.
over the two years是现在完成时态的标志,意思是这两年来,叙述的事情发生在过去,截止到目前做出一个评价,现在完成时态单数第三人称,因而用has+动词的过去分词.A是一般现在时态,B是一般过去时态,D是过去完成时态,与题意不符.