1.a 2.a 3.plent of rain 4.a 5 .a 6.has 7.a
.He,together with his father_____been to Shanghai twice.
together with his father为插入语主语是he 所以用has
.to one's _______a.surprise b.surprised
one,s 后跟名词 所以选a
a.sometime某个时 间b.some times 几次c.sometimes某时 d.some time 一段时间