While reading, you'd better make a mark ___ you have any questions.
#71737
A
on which
B
at where
C
the place where
D
where
推荐题目
       you may have, you should gather your courage to face the challenge.
#68062
A
However a serious problem
B
What a serious problem
C
However serious a problem
D
What serious a problem
London,______ last year, is a nice old city.
#73949
A
that I visited
B
which I visited
C
I visited
D
where I visited
     in the regulations that you should not tell other people the password of your e-mail account.
#72904
A
It requires
B
It is required
C
What requires
D
What is required
It would be a good idea to use a plastic bottle, ___cut off, as a container to grow young plants in.
#72394
A
of which the top
B
the top is
C
top of which
D
with its top