— Why does the Lake smell terrible? — Because large quantities of water _____.A.
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— Why does the Lake smell terrible? — Because large quantities of water _____. |
A. have polluted B. is being polluted C. has been polluted D. have been polluted |
答案
举一反三
A lot of tents, drinking water and food _____ to the homeless earthquake survivors in the past several weeks. |
A. are sent B. were sent C. have been sent D. had been sent |
Members do not need to repeat the information which _____ before. |
A. has submitted B. had been submitted C. has been submitted D. submitted |
Two thirds of the subway construction ____ so far and people will enjoy a fast and convenient trip under the city early next year. |
A. have been completed B. is being completed C. has been completed D. will be completed |
— Can you tell me what time the flight to Detroit leaves? — I"m sorry, but it ____ due to the fog. |
A. has been canceled B. had been canceled C. has canceled D. had canceled |
The first edition ____ in 1955 and ____ a best seller ever since. |
A. was published; had been B. had been published; had been C. has been published; has been D. was published; has been |
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