While previewing his lessons, the little boy will make a question mark ________ there is a question.
#67602
A
where
B
when
C
because
D
which
推荐题目
(2013·江苏，28)In the global economy，a new drug for cancer，________it is discovered，will create many economic possibilities around the world.
#67442
A
whatever
B
whoever
C
wherever
D
whichever
_________, he knows a lot about space and satellite.
#69509
A
A child as he is
B
As he is a child
C
Child although he is
D
Child though he is
House prices vary from place to place and are usually high ____ there are famous schools.
#67577
A
since
B
when
C
whether
D
where
It’s more than half a century _________ my grandfather joined the Party and became a servant to the people.
#71853
A
when
B
that
C
since
D
while