SAT三道語法題求助!
A severe northeastern storm struck Boston on New Year's Day,1990,slowing down the loading of ships in the (harbor,the city was caught off guard because of the Weather Bureau being closed for the holiday.)答案是harbor,the city was caught off guard because the Weather Bureau was closed for the holidays.為什么不能寫成harbor,catching the city off guard because the Weather Bureau was closed for the holidays.原句的struck是過過去式還是過去分詞?
No one but a fool would readily lend money to a person who （is） known as a frequent gambler.答案說原句沒有錯,可是前面是would后面的is為什么不用改成was?
The plans proposed by the students for the homecoming celebrations are perfectly clear and （it is） well within our （budget,however,） the plans are not likely to be approved by the administration.答案說這個it is有錯,錯在哪兒?指代不明嗎?還有,這句話的however為什么前后都可以接完整的句子而且不用把其中的一個逗號改成分號或者句號?