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单选题
2520. 在某些情况下,尤其是对于复杂的飞机,可能需要针对飞机及其系统的适当维修提供专门培训。
A
In some cases, for complex aircraft, special training should be conducted so that the aircraft and its systems can be maintained properly.
B
Sometimes, especially for complex airplanes, it may be necessary to provide specific training in the proper maintenance of the airplane and its systems.
C
Sometimes, for particularly complex airplanes, it is required to provide special training so as to perform proper maintenance of the aircraft and its systems.
答案解析
正确答案：B
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