单项选择题


A．as to
B．as for
C．as if
D．as well as
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单项选择题
A．preparingB．prepareC．preparedD．prepares
A．preparing
B．prepare
C．prepared
D．prepares
单项选择题
A．atB．intoC．duringD．between
A．at
B．into
C．during
D．between
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