— should teenagers spend at least 30 minutes taking exercise?
—Five times a week，according to some reports．
| A．How much | B．How soon |
| C．How long | D．How often |
— should teenagers spend at least 30 minutes taking exercise?
—Five times a week，according to some reports．
| A．How much | B．How soon |
| C．How long | D．How often |
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