It is quite apparent that the aging population in China will cause _____ heavy pressure on ____ whole society in the future .
| A．a, / | B．/ ;/ | C．a ; the | D．/ ; the |
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It is quite apparent that the aging population in China will cause _____ heavy pressure on ____ whole society in the future .
| A．a, / | B．/ ;/ | C．a ; the | D．/ ; the |
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