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

<上一题目录下一题>

热门试题

单项选择题______ being the coldest winter on record, it’s also been the wettest.

单项选择题______ as it was at such a time, his work attracted much attention.