1.Nancy ___ she ___ her life for his country .

1.Nancy ___ she ___ her life for his country .
A .said,had given B.says,will give C.said,would give D.said,gave
2.He has taught in high school since he ___ work.
A.began to B.begins to C.begun to D.begins to
3.Look!Here ___ a teacher .
A.came B.comes C.is coming D.has come
4.He ___ a new film after school today.
A.sees B.is going tu see C has gone to Dsee
5.Before Mr.White went to Paris he ___ French for two years .
A.will learn B.has learned C.had learned D.was learning
我都知道答案,但是应该怎么解释呢?
1.C 2.A 3.B 4.B 5.C
但是第三题为什么要用一般现在时而不用进行时呢？
还有 主语后面能不能跟动词的过去分词呢？