Question

高一英语（定语从句）

The children were all interested in __ they had been in the exhibition.
A.which B.that all C.all what D.all that

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不是说，介词后面用which，但是答案的B.C.D中都有个all，而all有和that一起用，但这道题是不是就有A.D两个答案了？
还是说，介词如果和后面的先行词有联系，先行词就用which/whom，如果介词和后面的先行词没有关系，先行词用什么都不要紧？

Answer 1

1.at
which
(at
the
age
of...:在...岁的时候;还原句:Children
can
go
to
school
at
the
age
of
7;先行词为the
age，关系代词为which，wihch替代the
age)
2.during
which
(during
the
time:在这段期间;during
spring:在春季;还原句:people
often
go
sightseeing
during
spring/during
the
time
of
spring;先行词为the
time，关系代词为which，wihch替代the
time)
3.of
which
(the
author
of
the
book:该书作者;还原句:the
author
of
the
book
is
a
worker;先行词为the
book，关系代词为which，wihch替代the
book)
4.without
which
(还原句:without
your
help
we
could
not
have
finished
the
work
on
time;先行词为your
help，关系代词为which，wihch替代your
help)
5.on
which
(on
the
building:在楼顶;还原句:on
the
building
flew
a
fed
flag
all
the
year
round，先行词为the
building，关系代词为which，wihch替代the
building;这里flew
a
red
flag为倒装用法，可还原成:a
red
flag
flew
all
the
year
round
on
the
building;)
6.for
which
(for
the
reason:因为该理由;还原句:I
bought
the
roses
for
the
reason
that...;先行词为the
reason，关系代词为which，wihch替代the
reason)
7.with
which
(with
sth.:通过使用...;还原句:he
could
study
the
skies
with
the
telescope
in
hie
free
time，通过使用望远镜来研究风筝;先行词为the
telescope，关系代词为which，wihch替代the
telescope)

Answer 2

选D. 这里的in是和前面的be interested in搭配的.而in wihch/whom中的in是和定语从句中的动词联系的,不是一回事.