to the institute.

　　12．Until then he ________________(know) nothing about it yet.

　　【答案】　1.had been staying　2.had been working　3.had been studying　4.had been listening　5.had been writing　6.doesn't eat　7.happens　8.apologizes　9.are；watching

　　10．had left；came　11.learned　12.had known

　　Ⅱ.单句改错

　　1．As she entered the hall, we noticed her dressing a beautiful evening dress.

　　________________________________________________

　　2．Waste water from a number of cities is now cleaned before floating back into rivers.

　　________________________________________________

　　3．Your coat is just hung over there at the back.

　　________________________________________________

　　4．How can we imagine him to do such a silly thing?

　　________________________________________________

　　5．All the rivers should be prevented from polluting.

　　________________________________________________

　　6．The sudden earthquake sent thousands of people to rush out of the house.

　　________________________________________________

　　7．He works hard no matter when I see him.

　　________________________________________________

　　【答案】　1.dressing→wearing　2.floating→flowing　3.hung→hanging　4.to do→doing　5.polluting→being polluted　6.to rush→rushing　7.works→is working

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