( )the plane will arrive on schedule remains unknown A、If B、That C、Whether D、When

问题描述:

( )the plane will arrive on schedule remains unknown A、If B、That C、Whether D、When
He went to bed very early ,( )his homework ( )
A 、left ,unfinished B、leaving,unfinishing
C、leaving,unfinished D、left、unfinishing

c
c