单项选择题

Too much salt is known to contribute to hypertension, ______ is a factor in half the deaths in the U. S. each year.

A. what
B. that
C. which
D. this
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单项选择题
______ being the coldest winter on record, it’s also been the wettest.
A. Moreover
B. Besides
C. Although
D. Furthermore
单项选择题
______ as it was at such a time, his work attracted much attention.
A. Published
B. Having published C. Publishing
D. To be published
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