A new study shows older men          a lack of deep sleep are nearly twice as likely to develop high blood pressure.
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A
suffering for
B
who is suffering
C
who suffer from
D
who suffer to
推荐题目
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
Recently I bought an ancient Chinese vase,________ was very reasonable.
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A
the price of it
B
its price
C
the price of which
D
the price of whose