问题
选择题
| Shenzhou VI ________ around the earth for 115 hours. |
A. has been flown B. has been flying C. flew D. will fly |
答案
答案：B
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| Shenzhou VI ________ around the earth for 115 hours. |
A. has been flown B. has been flying C. flew D. will fly |
答案：B