\"但应该是一个具体时间?\" Blink, let's analyze his question here: What time you are going to see dentist? 從上边句子看,hw79怎解用\"What time you are... 而唔是: What time are you... 需要个具体時間? 莫非tricky part is the timing? Yes. You are going to see Den-tist?(-真係訂死你? 牙医該貴...joking!) hw79, the answer is: one time?