题文
When I try to understand ________ that prevents children from getting fat, it seems to me that there are two reasons.
| A．why it is |
| B．what it is |
| C．why is it |
| D．what is it |
推荐试卷
When I try to understand ________ that prevents children from getting fat, it seems to me that there are two reasons.
| A．why it is |
| B．what it is |
| C．why is it |
| D．what is it |
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