I won"t tell the student the answer to the math problem until he _____ on it for
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I won"t tell the student the answer to the math problem until he _____ on it for more than an hour. |
A. has been working B. will have worked C. will have been working D. had worked |
答案
举一反三
I have to see the doctor because I _____ a lot lately. |
A. have been coughing B. had coughed C. coughed D. cough |
Police are now searching for a woman who is reported to ____ since the flood hit the area last Friday. |
A. have been missing B. have got lost C. be missing D. get lost |
Mother wanted to be a good provider, a role she ______ since her marriage to Father. |
[ ] |
A. shoulders B. shouldered C. is shouldering D. has been shouldering |
Cathy is taking notes of the grammatical rules in class at Sunshine School, where she _____ English for a year. |
[ ] |
A. studies B. studied C. is studying D. has been studying |
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[ ] |
A. work B. are working C. have been working D. worked |
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