问答题

A．in
B．for
C．upon
D．with

A.in
B.for
C.upon
D.with

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A．that
B．whether
C．what
D．either

A.that
B.whether
C.what
D.either

A．introduces
B．follows
C．takes
D．approaches

A.introduces
B.follows
C.takes
D.approaches