關(guān)于幾道sat語法題
1.To persuade his parents to let him study abroad,Kenneth described other students' positive experiences,(explains how foreign study would benefit his future career,and assured) them that he could get financial aid.
括號里應(yīng)該改為explained how..（后面一樣）,為什么逗號能連三個動詞啊?不是一個句子里只能有一個動詞嗎?
下面兩題問括號里為什么錯了,怎么改?
2.Cuban music was so popular in the Colombian city of Cali (thus becoming )the basis for the dance scene that predominated three during the 1940s.
3.In 1988 a Soviet icebreaking ship helped free three gray whales that had become trapped in the Arctic ice after they (had swam) into the coastal waters of Alaska to feed.