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.
单项选择题
A．4.B．8.C．5.D．18.
A．4.
B．8.
C．5.
D．18.
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