If you feel tired and sick of fat food, that is ______ you have to go to the hos
题型：不详难度：来源：
If you feel tired and sick of fat food, that is ______ you have to go to the hospital for medical examination.| A．why | B．whether | C．when | D．what |
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答案
| C |
解析
| 主要测试表语从句。译文：如果你感到疲惫，而且不喜欢油腻食物，那就是你必须去医院做个检查的时候了。 |
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