单选题
We are not (conscious of) the extent (of which) work provides the psychological satisfaction (that) can make (the difference) between a full and an empty life.
A、
conscious of
B、
of which
C、
that
D、
difference
【正确答案】
B
【答案解析】
of which 改为to which。which代替前面的先行词 extent，其前面应当用介词to。
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