The visiting professor gave us some advice,________ of great help to our English learning.
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A
I think it is
B
I think which is
C
which I think is
D
which I think it is
推荐题目
They will fly to Washington, ______ they plan to stay for two or three days.
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A
where
B
there
C
which
D
when
St Pertersburg, ______is a very beautiful city, was once called Leningrad..
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A
which
B
that
C
when
D
where
It is said that many kids are worried about the year 2012, _____ , they think the earth will be destroyed by disasters．
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A
where
B
as
C
when
D
which