21.According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey. D (A) doubling those reported in the 1977 survey (B) to double the number the 1977 survey reported (C) twice those the 1977 survey reported (D) twice as much as those reported in the 1977 survey (E) twice the number reported in the 1977 survey 答案选E，看曼哈顿时说有时候用times直接修饰，而不用as或than，可是具体是什么情况用呢？
还有885-3-18.Since 1970 the number of Blacks elected to state and federal offices in the United States has multiplied nearly four times. (A) has multiplied nearly four times (B) has almost quadrupled (C) has almost multiplied by four (D) is almost four times as great (E) is nearly fourfold what it was 选B，不太明白倍数的啊。。。求解释~~~
885-3-18 用现在完成时，排除DE A中multiple和four times意思重复有冲突 C by four 表达有误
-- by 会员 期期啦啦 (2012/3/30 10:45:37)
multiple 为什么跟four times 有冲突啊。。multiple by xx times 也不对么。。那multiple表示增加怎么用啊
-- by 会员 losaohan (2012/3/30 14:27:52)
不要沉呀呜呜
-- by 会员 losaohan (2012/4/3 11:32:29)
L, 你C姐来了~ multiply用法： 切记，当Multiply做成倍增长或乘时，multiply的动作发出者不是数字本身，当以被乘数做主语时一定要用被动语态，这是它和quadruple的区别！！！ multiply A by B A is multiplied by B. Four multiplied by seven is twenty-eight.
four times与multiply不冲突，times做副词，可译为次、倍。four times置于句末，做状语，表示四倍或者四次 A is multiplied four times. A的四倍（用被动，不要加by） A is multiplied by itself four times. A的四次方
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发表于 2012-3-16 11:50:25
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