Ifeltsomewhatdisappointedandwasabouttoleave,_____somethingoccurredwhichattractedmyattention.
A.unless B.when C.until D.while正确答案B
Ifeltsomewhatdisappointedandwasabouttoleave,_____somethingoccurredwhichattractedmyattention.
A.unless B.when C.until D.while正确答案B