【单选题】【消耗次数：1】
It is only when you nearly lose someone ____ fully conscious of how much you value him.
①
do you become
②
then you become
③
that you become
④
have you become
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Fine. How are you?
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How do you do? Glad to meet you, too.
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How are you? Thank you!
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Nice. How are you?
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