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In a review of 2,000 studies of human behavior that date back to the 1940s, two Swiss psychologists, declaring that since most of the studies had failed to control for such variables as social class and family size, none could be taken seriously.
A
psychologists, declaring that since most of the studies had failed to control for such variables as social class and family size,
B
psychologists, declaring that most of the studies failed in not controlling for such variables like social class and family size, and
C
psychologists declared that since most of the studies, having failed to control for such variables as social class and family size,
D
psychologists declared that since most of the studies fail in controlling for such variables like social class and family size,
E
psychologists declared that since most of the studies had failed to control for variables such as social class and family size,
【申友解析】
本句的主语是Swiss psychologists，谓语是declare，因为是过去时，所以是要用过去时态，且如果用 declaring，则主语没有谓语，不能用。 A declaring做状语，主句没有谓语动词，错误 B declaring做状语，主句没有谓语动词，错误 C 时态错误，本句是一般过去时，having done时态不对，错误 D such like用词错误 E 正确
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