– What do you think of teaching, Bob?-- I find it fun and challenging. It is a job ________ you are doing something serious but interesting.
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A
that
B
which
C
when
D
where
推荐题目
They are only children of not more than twelve and don’t realize_______to organize such an exhibition.
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A
when they take
B
what it takes
C
how they take
D
what takes them
The factory was built in a secret place, around ______ high mountains.
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A
which was
B
it was
C
which were
D
them were
British scientists have produced _____ they believe is the world’s smallest Christmas card．
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A
which
B
who
C
that
D
what