句子写作：”HappyChristmas“hesaid.
“Happy Christmas “he said, smiling and picking out two flowers.
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Wepromisethatwe’llmeetagainafterwe_______ourcollegeeducationinthreeyears’time.
Tounderstandthesentence,youshouldanalyzeitsparts________.
Thereistheappreciationofthesalienthistoricaltruth________theagingofadvancedsocietieshasbeenasuddenchange