在运行中担任飞行机组必需成员的驾驶员，应当在前90个日历日之内，在所服务的该机型别飞机上，至少已做过多少次起飞和着陆，否则不得担任这一职务？ No pilot may act as the flight crew member unless he/she has made ____take-offs and landings within the preceding 90 days in the type of airplane in which that person is to serve.
A.1
B.2
C.3
正确答案是C