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
When you read a book, you should make a mark ______ you have any question.
#68272
A
where
B
which
C
that
D
what
He often helps the students _______ he thinks are not quick at their studies.
#69855
A
whom
B
who
C
when
D
because
The news has spread all over the country ____ the spaceship succeeded in returning to the earth.
#68158
A
which
B
that
C
whether
D
what