They________extensiveandpossiblydangerousactualflighttraining.-查字典考试网

They________extensiveandpossiblydangerousactualflighttraining.

A、undertake
B、undergo
C、underplay
D、underuse

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正确答案：

答案解析：

句意：他们经历了大量的并且可能是危险的实际飞行训练。

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