Bob would have helped us yesterday, but he _____. [ ]A. was busyB. is busy C
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Bob would have helped us yesterday, but he _____. |
[ ] |
A. was busy B. is busy C. had been busy D. will be busy |
答案
A |
举一反三
Scientists have many theories about how the universe _____ into being. |
A. came B. was coming C. had come D. would come |
The Roman Empire _____ for several centuries. |
A. exists B. existed C. was existed D. is existing |
After the traffic accident, no one _____ except a few people who were badly injured. |
A. survive B. survived C. was survived D. was surviving |
Hidden _____ by a big tree, his house was not to be seen. |
A. as it was B. as it is C. as it did D. as he did |
My father knows a lot about American culture, for he _____ there for 2 years, and then he returned home. |
[ ] |
A. stays B. stayed C. would stay D. have stayed |
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