A：which we think are important
B：which we think that is important
C：we think which are important
D：which we think is important
A：It
B：As
C：That
D：What
A：whom
B：which
C：they
D：who
A：its
B：whose
C：which
D：that
A：who
B：which
C：what
D：that
A：of which details
B：and the details of which
C：the details of it
D：the details of which
A：which
B：where
C：whoseD .that
A：which
B：what
C：when
D：where
A：what
B：who
C：that
D：which
A：as
B：whose
C：that
D：which
A：that
B：when
C：where
D：what
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