In 1988 a Soviet icebreaking ship elped free thregray whales that had become trapped in the Arctic ice aftre they 【had swam】 into the coastal waters of Alaska ot feed.这里错误是had swam应改为had swum,但这里两个过去完成时用after

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.这里面有一个时态错,求高人告诉我哪个错并且为什么,我过去 SAT语法题.2010年一月的.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. had swam错了.我知道.可是我说不出原 In 1988 a Soviet icebreaking ship elped free thregray whales that had become trapped in the Arctic ice aftre they 【had swam】 into the coastal waters of Alaska ot feed.这里错误是had swam应改为had swum,但这里两个过去完成时用after Soviet soviet Soviet 一道英语语法题,求助,谢谢.In 1987 a Soviet icebreaking ship helped free three gray whales that had become trapped in the Arctic ice after they had swum into the coastal waters of Alaska to feed. 此句正确.1.这句话中用了两个过去 英语翻译when the Soviet Union wants to make a propaganda point in the Mideast,it use English not Russian 英语翻译是 Ice freezes deeply not in a day 将下面的句子转化成被动语态In the Soviet Union a state commision organises a search for extraterrestrial intelligence,and it has just completed one program. Ice in 中文意思！ walk on ice 还是 walk in ice? soviet是什么意思 the Soviet 英语翻译While no major agreementwas signed by the United Statesand the Soviet Union in Reykjavik,the two countries made progress in arms control talks in areas that are a central concern to America's European allies.Those particular areas involve 一道GMAT逻辑题A ten-year comparison between the United States and the Soviet Union in terms of crop yields per acre revealed that when only planted acreage is compared,Soviet yields are equal to 68 percent of United States yields.When total agri 求问GRE逻辑题A ten-year comparison between the United States and the Soviet Union in terms of crop yields per acre revealed that when only planted acreage is compared,Soviet yields are equal to 68 percent of United States yields.When total agric 英语翻译Communists began to play a hidden,but important part in South China,putting teeth into Guomindang,hoping to use it as a means to a Soviet-style revolution.