Americans eat____ vegetables per person today as they did in 1990
A.more than twiceB.as twice as manyC.twice as many asD.more than twice as many在线课程D
解析：
考查倍数表达。more than twice as many vegetables as两倍多的蔬菜;倍数要放在as…as结构的前面。句意：美国人现在每天吃的蔬菜是1990年的两倍多。