这个句子本身就有语法错误,因为message不能自己发送自己,应该用被动语态,另外主谓一致的单复数也有问题.
how many messages have been sent?how many messages were sent?
这里即使要表达一般过去时,也不能用did,除非把发出动作的人补出,如:
How many messages did you send?
这个句子本身就有语法错误,因为message不能自己发送自己,应该用被动语态,另外主谓一致的单复数也有问题.
how many messages have been sent?how many messages were sent?
这里即使要表达一般过去时,也不能用did,除非把发出动作的人补出,如:
How many messages did you send?