题目

The Science Festival in May attracts the students from the very beginning with its opening ceremony. That is an occasion ________ model planes and model rockets are flown over the school grounds. A . that B . which C . where D . when 答案：D3. ——当你4岁时，你会唱英语歌吗？一 English songs when you were 4 years old?一不，我不能。— ，I.