【单选题】
A An aircraft may approach to land, only after an clearance has been obtain from the ATC controller of the control tower
B An aircraft may approach to land, only after a clearance has been obtained from the ATC controller of the control tower
C An aircraft may approach to landing, only after an clearance has been obtained from the ATC controller of the control tower
D An aircraft may approach to landing, only after a clearance has been obtain from the ATC controller of the control tower
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