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单选题

The phrase “unable to comply” is used _______ ．

Aby the controller before he amends the clearance or instruction

Bby the pilot to advise the controller he cannot carry out the clearance or instruction received

Cby the pilot before he takes action on the clearance or instruction received

Dby the controller to inform that he cannot comply with the pilot’s requirement

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正确答案：A （备注：此答案有误）

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