单项选择题


A．which
B．that
C．what
D．who
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单项选择题
A．as toB．as forC．as ifD．as well as
A．as to
B．as for
C．as if
D．as well as
单项选择题
A．preparingB．prepareC．preparedD．prepares
A．preparing
B．prepare
C．prepared
D．prepares
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