问题补充：
----Could you tell us how long ?
---- About three days.
A. does the sports meeting last
B. the sports meeting will last
C. the sports meeting last
D. will the sports meeting last
答案：
A. does the sports meeting last
(答案→)B. the sports meeting will last
C. the sports meeting last
D. will the sports meeting last
解析：宾语从句的考察 宾语从句的语序应为陈述语序A、D不正确，“你能告诉我运动会持续几天”可知运动会还没开始，应为一般将来时。
