【C19】A．whenB．whichC．whoD．where

【C19】A．whenB．whereC．howD．if

【C5】A．whenB．whichC．howD．it

材料题请点击右侧查看材料问题 查看材料A.whenB.thatC.whoD

【C7】A．whenB．whichC．whereD．that

52._________A. whenB. thatC. whoD. whose

See the flags on top of the building? That was _____we did this morning.[ ]A. whenB. whichC. whereD.