If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it．
#78593
A
where
B
that
C
which
D
what
推荐题目
These articles are written in simple language, _____ makes it easy to read.
#77884
A
that
B
this
C
which
D
it
He left here for Beijing in 1998 ,____I have heard nothing from her.
#77439
A
since then
B
since when
C
from then on
D
after that
The air quality in our city, _____is shown in the report, has improved a lot recently.
#77049
A
that
B
what
C
where
D
as