The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
| A．where |
| B．whether |
| C．how |
| D．that |
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The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
| A．where |
| B．whether |
| C．how |
| D．that |
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