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问题: 英语选择题目

1,When the president and his delegation left the country,____of people were at the airport to _________.
A thousand,see off them.B thousands,see off them C thousand,see them off. D thousands,see them off.选择哪项,为什么???
2,They______us their help without being asked.
这个题目答案是offered,为什么是这个答案???

解答:

1.D --------thousands要用复数,see sb off:习惯用语
2.offer sb sth:向某人甘愿提供,不要求对方回报