问题
选择题
| Some exercises appear to be ____ ones you have done, but on ____ second thoughts, you'll find that they're different. |
A. /; the B. the; / C. the; a D. /; / |
答案
答案：B
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| Some exercises appear to be ____ ones you have done, but on ____ second thoughts, you'll find that they're different. |
A. /; the B. the; / C. the; a D. /; / |
答案：B