It ________ have been her to leave her child alone and do whatever she wanted. She isn't such a person.

A．couldn't　

B．mustn't

C．mightn't　

D．wouldn't

压力容器在使用中会产生各种缺陷，如（）等，如不及时发现，易发生事故。

A、裂纹

B、腐蚀

C、鼓包变形

D、材料老化

E、以上都是