Question

【题目】You can never imagine what great trouble we have had （organize）the Sports Festival successfully.

Answer 1

【答案】organizing
【解析】句意：你无法想象我们在成功地组织体育节时遇到多大的麻烦。固定词组：have trouble (in )doing sth.在做某事上有麻烦。所以答案是organizing。