题文
The reason __________ he explained was __________ he was ill and unable to go to school.
| A．why; that | B．why; because |
| C．which; because | D．which; that |
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The reason __________ he explained was __________ he was ill and unable to go to school.
| A．why; that | B．why; because |
| C．which; because | D．which; that |
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