【SAT】三道SAT文法题目求解释~（OG上的）

【SAT】三道SAT文法题目求解释~（OG上的）
1.The bagpipes originated in ancient Sumer,many people assume that it was the Scotish Highlands.
要改正“many people assume that it was ”部分
A.not ,as many people assume,in
B.but many people assume it to be
为什么B不对?是因为语气的重点还是语法错误?
2.Many drivers violate traffic laws knowingly and openly,in other respects they are law-abiding citizens,however.
整句改.
A.Many drivers who are otherwise law-abinding citizens violate traffic laws knowingly and openly.
B.Although otherwise law-abinding citizens,many drivers,however,violate traffic laws knowingly and openly.
为什么选A不选B?
3.Ms.Jordan proudly demonstrated her company's most popular product,a watch that flashes the time in lighted numerals when pressing a button.
答案显示“pressing a button" 错了,为什么?（我选了No error那项）
感激!