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—You probably won't need to call Joe, but take his number, just ________.

—Thanks a lot.

A．at random　B．in return

C．in case　D．by heart

【解析】　——你可能不需要給Joe打電話，不過還是記下他的電話號碼吧，以防萬一。——謝謝！in case“以防萬一”，符合語境。

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