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- 问题详情：LindaandDavidhavetraveledbyairfromLondontoSydney,Australia．Lindahaspromised（答应）hermotherthatshewillringhertoletherknowthattheyhavearrivedsafely．Thisissomethingshehaddoneeversinceshewasachild．Davidthinksitisnotagoodideatoringsofar,tospendtoomuch,...
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