20. To tell you the truth, it's very hard for us to help them get rid of Internet addiction. But we _________ on this problem trying to improve the situation. A) worked B) had worked C) are working D) had been working
C
举一反三
- He felt very tired because he ______ 18 hours without a rest. A: had worked B: worked C: was working D: had been working
- I first met Mary three years ago when we ______ in a middle school together. A: have worked B: had been working C: were working D: had worked
- 26.Jane was tired. She__________all day. A: was working B: has worked C: worked D: had been working
- I ______ on a maths problem when he telephoned me early this morning. A: [A] had worked B: [B] was working C: [C] have worked D: [D] have been working
- All the staff of the company ________very hard last year and 15% more profit was gained. A: worked B: had worked C: have worked D: were working
内容
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By the end of last week, he ________ in the company for 10 years. A: had worked B: had been working C: will have worked D: would have worked
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For some time now, Eric ______ for foreign trade. A: had been working B: was working C: has been working D: worked
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They ________ in the office this time yesterday evening. A: still worked B: has been working C: were working D: had been working
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They ______ on the program for almost one week before I joined them. A: had been working B: bad worked C: have been working D: have worked
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He didn't look well, for he _______ for sixteen hours A: had worked B: was working C: had been working D: works