单项选择题

Jack was invited to ___________his friend’s birthday party this Friday.

A．attend
B．attends
C．attended
D．attending

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《左传》中，“皮之不存”的下一句是什么？

答案：正确答案：毛将焉附

不定项选择

‍The Gauss-Markov theorem does not rely on the normal distribution assumption of .‎

A．正确
B．错误