填空题

Yesterday Professor Li received an (invite) ______ to speak at an academic conference.

【参考答案】

invitation
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填空题
sitting
单项选择题
A．3 times.B．5 times.C．6 times.D．2 times.
A．3 times.
B．5 times.
C．6 times.
D．2 times.
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