---Do you know who taught________French?

---Nobody. They learned it by ________.

A. their; themselves B. them; them C. them; themselves D. their; them

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Have you ever counted the number of digits (數(shù)字) in your mobile phone number? Your number has 11 digits. You may sometimes find it hard to remember your number. That’s because China has the longest mobile phone numbers in the world. Why is that?

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