单项选择题

A．At the beginning of the 3rd semester.
B．At the end of the 3rd semester.
C．At the beginning of the 2nd semester.
D．At the beginning of the 1st semester.
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单项选择题
A．To invite him to attend a seminar.B．To inform him about some changes in the arrangement for his seminar.C．To invite him to visit the lab.D．To inform him that the seminar has been postponed.
A．To invite him to attend a seminar.
B．To inform him about some changes in the arrangement for his seminar.
C．To invite him to visit the lab.
D．To inform him that the seminar has been postponed.
填空题
comfortable
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