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23. Researchers found that the number of best friends boys and girls have _____ different. It is common for girls of school age to have one best friend, but boys usually have several good friends.
(A) is
(B) has been
(C) are
(D) have been

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 【站僕】摩檸Morning：有沒有達人來解釋一下?
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23. Researchers found that the number of..-阿摩線上測驗