Not I have dropped,but you have.

Not I have dropped,but you have. A：Have you found your keys? B: Not yet. I think I dropped them on the bus.这里的I think I dropped them on the bus.中的dropped和之前的think时态不一致,从语法上分析应该怎么理解? B ) 39.It was the third time that I _______ in at his office.A.have dropped B.had dropped C.droB ) 39.It was the third time that I _______ in at his office.A.have dropped B.had dropped C.dropped D.was dropping( A ) 41.The flowers want _______.Look,th My wallet is nowhere to be found.I ___________ in the store.A.drops B.must have dropped it C.dropped D.dropping Your temperature has dropped,so you _______ take that medicine.A.do not B.must not C.needn’t D.should not have to Tom was ill for a long time.Now his grades____A.dropped B drops C have dropped D are dropped I () have dropped it on the floor.() 怎么填 My wallet is nowhere to be found.I ( )when I was on the busA.must drop it B.should have dropoed it C.must have dropped it D.had dropped it I （）snacks A,have no B,am not have C,have notD,not have ( ).-- DO you still have a headache,Bill?-- No,it's _________.I'm all right now,mum.A.dropped B.run C.left D.gone 弱弱的问个弱智问题.I think you have dropped _________r in writing merry.A.an B.a C.the D./填哪个? -- DO you still have a headache,Bill?-- No,it's _________.I'm all right now,mum.A.dropped B.run C.left D.gone - No,it's ____.I'm all right now,Mum.A.dropped B.run C.left D.gone-Do you still have a headache,Bill? I ( )my wallet when I was shopping in the store.答案为什么选择must have dropped而不是ought to have dropped? I do not have I have not finised I do not have I do not have?