2. 外语
  3. All the hard tasks______because of their joint effort, they decide to go on holiday for a month.

All the hard tasks______because of their joint effort, they decide to go on holiday for a month.

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问题 All the hard tasks______because of their joint effort, they decide to go on holiday for a month.
选项 A、have been fulfilled
B、having been fulfilled
C、were fulfilled
D、having fulfilled
答案B
解析 该题是语法结构题，考查分词的独立主格结构。句中用“名词+现在分词完成被动式”独立结构来表示时间“在他们的共同努力下所有艰难的任务都完成了之后”。如选A，第一分句后不能用逗号，必须用句号或分号。如选C，除了与A一样标点符号不对外，时态也不对。D项是主动语态，不能用于该独立主格结构中。因此，根据题意和语法规则，选项B为最佳答案。
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