private static function getQuestionData($testObjId, $questionIds)
 {
     global $ilDB, $lng, $ilPluginAdmin;
     require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionList.php';
     $questionList = new ilAssQuestionList($ilDB, $lng, $ilPluginAdmin);
     $questionList->setParentObjIdsFilter(array($testObjId));
     $questionList->setQuestionInstanceTypeFilter(ilAssQuestionList::QUESTION_INSTANCE_TYPE_DUPLICATES);
     $questionList->setIncludeQuestionIdsFilter($questionIds);
     $questionList->load();
     return $questionList->getQuestionDataArray();
 }