单项选择题

In some eases, your instructor may tell you the topics ______ or may give you a choice of top. les to write about.

A．in advance
B．ahead of
C．above all
D．right away
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单项选择题
A．ofB．forC．inD．to
A．of
B．for
C．in
D．to
单项选择题
A．cameB．wentC．returnedD．clung
A．came
B．went
C．returned
D．clung
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