-_______ can the batteries (電池) 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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Dear Alan,

Guess what? I have a chance to choose my new place to live in! I’m excited and a little nervous. Could you please give me some help?

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I’m looking forward to your reply.

Love,

Victor

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