— The window is dirty. — I know. It _____ for weeks.A. hasn"t cleanedB. didn"t c
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— The window is dirty. — I know. It _____ for weeks. |
A. hasn"t cleaned B. didn"t clean C. wasn"t cleaned D. hasn"t been cleaned |
答案
举一反三
Since 1949, the people"s living standard ____, causing a big ____ in population. |
A. has been raised; rise B. has been rose; raise C. has raised; rise D. has raised; rose |
The new dictionaries are very useful. They ______ well and ______ already. |
A. sell; have been sold out B. sold; had sold out C. sell; sell out D. are sold; have been sold out |
I got caught in the rain and my suit _____. |
A. has ruined B. had ruined C. has been ruined D. had been ruined |
All the preparations for the task _____, and we"re ready to start. |
A. completed B. complete C. had been completed D. have been completed |
Since the world heritage list was first created in 1972, many more sites _____ it. |
A. have added up to B. are added to C. have been added up to D. will be added up to |
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