单项选择题

A．She was taking a rest.
B．She was preparing for an exam.
C．She was taking an exam.
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单项选择题
A．Robin is happy.B．Robin is sick.C．Robin is very well.
A．Robin is happy.
B．Robin is sick.
C．Robin is very well.
单项选择题
A．were difficult to getB．had some practical useC．were considered valuable by all people
A．were difficult to get
B．had some practical use
C．were considered valuable by all people
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