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单选题
1090、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
Sometimes, especially for complex airplanes, it may be necessary to provide specific training in the proper maintenance ofthe airplane and its systems.
B
Sometimes,for particularly complex airplanes,itis required to provide special training so as to perform proper maintenanceof the aircraft and its systems.
C
In some cases, for complex aircraft, special training should be conducted so that the aircraft and its systems can bemaintained properly.
答案解析
正确答案：A
解析：
解析:注释:may be 可能; should be 应该。
相关知识点：
预防性维修按手册完成
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