see the flags on top of the building?
that was _____we did this morning.
选which 还是what?
see the flags on top of the building?
that was _____we did this morning.
选which 还是what?
选what
that was _____we did this morning.很明显,这里缺的是副词,而不是代词,which做的是关系代词,what引导表语从句 what指代插旗这件事