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169.Hello,could I speak to Mr.Smith?
Sorry,wrong number.There isn’t ____ Mr. Smith here.
A./
B.a
C.the
D.one
170. In _____ review of 44 studies,American researchers found that men and women who ate six key foods daily cut the risk of ___ heart disease by 76%.
A.a;the
B.the;a
C.a;/
D./;a
