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9、--- Su Xing went to study in Australia at 16 and he lived on himself for many years.

--- Oh, dear! He           a lot of difficulties.

A．could have gone through                             B．would have gone through

C．will have gone through                                D．must have gone through

9、D

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--- Su Xing went to study in Australia at 16 and he lived on himself for many years.

--- Oh, dear! He           a lot of difficulties.

A．could have gone through                             B．would have gone through

C．will have gone through                                D．must have gone through

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