You can never imagine what great trouble I have had ______ the customer to withdraw a claim.

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问题 You can never imagine what great trouble I have had ______ the customer to withdraw a claim.

选项 A、persuade
B、to persuade
C、persuading
D、persuaded

答案C

解析 此题容易根据had误选过去分词persuaded。解题关键在于识别固定短语have troubledoing sth.“做某事有困难”,what great trouble I have是一个感叹句结构,将其转化成正常结构,即I have had great trouble in doing.…所以答案为C。
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