—That actor often joins in different activities in Beijing. Do you know ________?

—For 5 years. [ ]

A. how soon he will come back

B. how long he has stayed there

C. when he went there

D. when he will come here

门窗反复启闭试验的中间检测间隔分别为：门不超过（）次反复启闭次数；窗不超过（）次反复启闭次数。