I am waiting for my friend.        , I will go swimming alone.

A．If he doesn’t come

B．If he won’t come

C．If he hasn’t come

D．If he isn’t coming

入境船舶白天入境检疫时，在船舷的明显处悬挂“QQ”字旗，表示本船没有染疫，请发给入境检疫证。