41.Before ____ the house,you should get a surveyor____ over it.A.buying...looking B.having bought...to look C.buying...to have looked D.buying...to look这个怎么选,为什么

It was February 10 the day before yesterday(改成特殊疑问句)____ ____ ____ ____ the day before yesterday? We should read the ____ before we take some medicine. ____ should buy tickets before theyget on the bus.(pass) you must ____(knock)on the door before you enter Nowadays,the trang is much ____(quick)than before The place has changed a lot.The place has been quite ____ ____ before. The boss commanded that____ _____ ____ ____(他的人不能离开)their office before dark Before he ____(come)here last year,he ____(teach)geography in the music school He had lived in the town (for six years) before i moved here 提问 ____ ____ ____he ____ in the town before you moved here? You can buy ____ in the shop before eight o'clock in the ____ because the shop opens late. A:Why doesn't Cindy come with us to the park?B:She has ____ to Paris.A:___she ____ to Paris before B:Yes,she ___ .She has ___ to France several times.A:It is ____ that her parents live in Paris .B:Yes ,she came to visit her parents.They would spend h We were swimming in the river ____ suddenly the rain started.为什么用when,不用before? Noise pollution was a problem before the ____ (close)of the old airport 为什么? We must ____(switch on/switch off)the lights before we leave the classroom. The old man ____ before the doctor arrived.had died died is dying dies She with his parents ____ been to the West Lake before (have/has) 为什么She with his parents ____ been to the West Lake before (have/has) The day before yesterday的同义词?They came to China the day before yesterday =They came to China___ ____ ____? she had her refrigerator the day before yesterday,____ she?she had her refrigerator repaired the day before yesterday,____ she?