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sat语法 Consumed in massive quantities for decades,Americans

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sat语法 Consumed in massive quantities for decades,Americans
7.\x05Consumed in massive quantities for decades,Americans have only recently begun to limit their intake of sugar.
A.\x05Consumed in massive quantities for decades,Americans have only recently begun to limit their intake of sugar.
B.\x05Americans have only recently begun to limit their intake of sugar after having consumed it in massive quantities for decades.
C.\x05American,consuming massive quantities of it for decades have only recently begun to limit their intake of sugar.
D.\x05Americans,consuming massive quantities for decades,are recently beginning to limit their intake of sugar.
E.\x05Consumed in massive quantities for decades,the intake of sugar by Americans had only recently been limited.
为啥不选d
这里考点是做语法题目时坚持原句的句意,结构.
原句用的是现在完成时,而B项没有改变;D改变时态.