—Those scientists invented a robot to care for kids!—It"s not surprising. They _
题型:同步题难度:来源:
—Those scientists invented a robot to care for kids! —It"s not surprising. They ________ wonders all the time. |
[ ] |
A. worked B. were working C. work D. have been working |
答案
D |
举一反三
— How do you find air conditioners made by Haier Group Corporation? — Of high quality. We ______ their products all these years. |
[ ] |
A. sell B. have sold C. have been sold D. have been selling |
Over the past decades, sea ice ______ in the arctic as a result of global warming. |
[ ] |
A. had decreased B; decreased C. has been decreasing D. is decreasing |
— Hi! John, would you like to play football with us? — Oh,I can"t. I ___ my lesson all the morning and still need half an hour. |
[ ] |
A. am reviewing B. have been reviewing C. have reviewed D. reviewed |
—Tony, come down and help me with the heavy box! —Come on! I _____ all day long. Get Peter to do that! |
[ ] |
A. work B. had been working C. had worked D. have been working |
She ______ on a new novel ever since this summer and it is supposed to ______ at the beginning of 2011. |
[ ] |
A. had worked; be published B. had been working; have published C. has worked; publish D. has been working; be published |
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