1.Many problems ----have been overcome --or -----never have

1.Many problems ____have been overcome --or _____never have arisen---if the people involved had just treated one another with commom courtesy.
A would,should B should,would C might,could D could,might
2._____photocopier is ______ machine that makes copies of documents,etc.by photographing them.
A the a B / the C A ./ D / /
第一题,我认为题目不怎么好,因为如果从不同的理解角度看(大多数问题本应该解决或者不会发生,如果.),选择B也是可以的,
第二题这种冠词的麻烦大家帮忙讲解下
不好意思 第二题选A