题目内容
（请给出正确答案）
[单选题]
Everyone must be present unless you have a _________ reason for asking for leave.
A.legitimate
B.legal
C.legitimacy
D.legitimately
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She sat in her seat, her hands gripping its arms, her seat belt already fastened. The air hostess was talking, telling everyone what to do in case of emergency, showing them where their .life-jackets were. The plane was crowded, every seat was full. From her window seat, getting out in a hurry would be impossible, thought Ann. In any case who would want to get out of a plane in mid-air？
The engines began to shake--the noise increased till it was like a great rushing wind. She looked out to see the runway slip past at astonishing speed. She wanted to cry out--to stop the plane before it left the ground, but she knew she was trapped in this great roaring machine. I must scream, she told herself, and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift. The noise died down. Carefully she opened her eyes. Through the window she saw a great carpet of cloud above, so beautiful that she stared in wonder, hardly turning away from the window till they touched down.
Ann thought she would be frightened because ______.
A．she had never flown before
B．she had a fear of being in high places
C．she hadn' t made proper preparations.
D．she was naturally timid
