问题
选择题
| It's difficult for any of us to eat better, exercise more, and sleep enough, _____ we know we should. |
| A. because B. even if C. as if D. unless |
答案
答案：B
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| It's difficult for any of us to eat better, exercise more, and sleep enough, _____ we know we should. |
| A. because B. even if C. as if D. unless |
答案：B