3.there are manypeople over there,what do you think ______ ?3.there are manypeople over there,what do you think ______ ?A)is happenedB)had happenedC)has happenedD)would happened请问答案为什么选C,请帮我详细的解答,谢谢~

There are There are there are are there 还是there are there are=there're There are some ---(German)there. 用英语单词组句,还要回答.1.Are these 2.Are those 3.Is there 4.Was there 5.Are there 6.Were there -What are ______over there?-There are boxes. there are still 还是 there still are there are some 还是there are two there are some apples.改为一般疑问句是（ ）1.are there any apples?2.are there any apple?3.are there some apples?4.are there some apple? There are no stduents in the classroom.1.There are_____ _____students in the _____.2.The classroom _____ _____students.3.The classroom _____ _____ _____studentsThere are many flowers over there.1.There are _____ _____ _____flowers over there.2.There 用there are 造句 There are造句 What are there is What are there? Are you out there 英语翻译There are some( ) ( ).