He must have lost his watch yesterday,_______he?A didn't B mustn't C hasn't D needn't为什么用A?

He can't find his key.He ---------- them.A.must lost B.must have been lost C.must have lost 英语翻译There must have been sth.wrong with him,for he had never lost his way in a big city. 23．—Tom hasn’t turned up yet.He might have got lost.—No,he .His car has got a GPS.23．—Tom hasn’t turned up yet.He might have got lost.—No,he .His car has got a GPS. A．must not have got lost B．wouldn’t have got lost C．ca The writer had lost his money.He felt upset.He must have been worried.请问:为什么要用have been,好象不是被动语态啊 i must have lost my key~不用have行不? He must have lost the key the day before yesterday,_____?A.must he B.hasn't he C.needn't he D.didn't he答案应该选D,为什么不选B?请说明原因, Where is my keys?I___________it.A.might lose B.would have lost C.should have lost D.must have lost Where is my pen?I_____it A.might lose B.would have lost C.should have lost D.must have lost 完形填空He must have been compietely lost in something he was reading because I had to tap on the ---What ever happened to Tom?---He lost.A.must be B.should have got C.may have got D.might be(为什么是表可能?) I must have lost them probably about half way through What we have lost somewhere must be found somewhere else. He must have lost his watch yesterday,_______he?A didn't B mustn't C hasn't D needn't为什么用A? You must pay for the library book if you____itA lost B have lost Cwill lose Dhad lost He must have done nothing but ____ Where is my book .I______ it.A.might lose B.would have lost C.should have lost D.must have lost 选什么 为什么 Where is my pen?I_____it.（b）A.should have lost B.must have lost C.would have lost D.might lose为什么不是d？ He looks tired,he _______ too little sleep.A must have had B must have C must have been