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• That was the first time I had gone there and I was impressed by the friendly people very 为什么用had gone?
• 1.It was very late to save the drowning boy as he had gone down for the third time.A B C D2.I can’t help to think it would be fun to play such an exciting game with them.A B C D3.John said his mother would buy him a five-speeds racing bicycle for his sixteenth birthday.A B C D4.By reading the directions carefully,some mistakes in the examination could have been avoided.A B C D5.Of the two lectures,the first was by far the best one,partly because the p
• That was the first time I had gone there and I was impressed by the friendly people very 为什么用had gone?
• 将直接引语改为间接引语：The teacher said,"Hand in your exercie books."
• 设数列{an}是一等差数列，数列{bn}的前n项和为Sn＝2/3(bn−1)，若a2=b1，a5=b2． （1）求数列{an}的通项公式； （2）求数列{bn}的前n项和Sn．