ExercisesContentsDownloadsUNIT 10: IF VS WHETHER – GRAMMAR SHORTSQuestion 1 / 10请完成全部题目,最后查看答案与解析GRAMMAR · GS Exercise 1 · UseiforwhetherChoose the best answer._____ we don’t leave now, we’ll miss our train.AIfBWhetherCBoth are correct保存并进入下一题 →