1.which.做visit及物动词的宾语.
2.u talk to .D.whom you talkeed 少了to.省略先行词.
3.A.that;for B.for;which
C.the one;for D.one;for
that for .其它无关系代词.
whose ,
who's 不存在.
are .先行词为experts.
the one .
关系代词可省,但先行词不可省.
about which u talk to .
that 前无介词.
with whom/
who 在从句中做宾语时用whom.
the low price of which.
非限定句.介词提前.主语倒装.
同上句一样,介词提前.
A.the smaller of which