【C13】
A．which
B．these
C．that
D．this
【C4】A．whichB．whatC．thatD．it
A．whichB．whatC．thatD．those
【C3】A．whichB．whoseC．thatD．what
【C8】A．whichB．whatC．thatD．who
【C2】A．whichB．whereC．thatD．when
【C7】A．whichB．whoC．thatD．why
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