______ their support, we’d be in a very difficult position.
A. It were not for
B. Were it not for
C. Not for it
D. If it were not
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He never went to see her again, ______ to apologize.
A. nor did he write
B. nor he did write
C. he did write
D. nor he wrote
______ to sleep than the telephone rang once again.
A. No sooner had he gone
B. No sooner did he go
C. He no sooner went
D. He had gone no sooner
Lisais really beautiful, and _______ when she had children.
A. so was her mother
B. so is her mother
C. her mother was so
D. her mother is so
哪一个是机器学习的合理定义?
A. 机器学习从标记的数据中学习
B. 机器学习能使计算机能够在没有明确编程的情况下学习
C. 机器学习是计算机编程的科学
D. 机器学习是允许机器人智能行动的领域
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