题文
-_______ can the batteries (电池) keep these cool iPhones and iPads working?
- For about ten hours.
| A．How much | B．How many |
| C．How long | D．How often |
-_______ can the batteries (电池) keep these cool iPhones and iPads working?
- For about ten hours.
| A．How much | B．How many |
| C．How long | D．How often |
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