There is still a strong argument ________ mobile phones are a particular risk to children.
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A
when  
B
which  
C
that 
D
what
推荐题目
 There were two boys in the lab,       did the experiment successfully.
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A
the clever of whom
B
the cleverer or whom
C
the clever of them
D
the more clever of them
 He made another wonderful discovery, ____ of great importance to science.
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A
which I think is
B
which I think it is
C
which I think it
D
I think which is
There are 104 elements found in nature, ___ are metals.
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A
most of it
B
that
C
most of which
D
mostly