问题
选择题
| If you feel tired out and unable to think clearly, that is ____ you have to get a rest. |
| A. why B. when C. whether D. what |
答案
答案：B
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| If you feel tired out and unable to think clearly, that is ____ you have to get a rest. |
| A. why B. when C. whether D. what |
答案：B