CET4

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考试2025-10-22

He was once a full-time ambassador.

He was soon to retire from the army.

He became an astronaut in 2015.

He used to be a helicopter pilot.

It has been unbelievably exciting and rewarding.

It has been extraordinarily tough and demanding.

It has contributed a great deal to human flights to space.

It has given him exceptional privilege as an ambassador.

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