题文
Now researchers say that middle age________be the most fruitful time of life, full of new growth and development.
| A．must |
| B．should |
| C．will |
| D．can |
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Now researchers say that middle age________be the most fruitful time of life, full of new growth and development.
| A．must |
| B．should |
| C．will |
| D．can |
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