prep p1-142.
(32496-!-item-!-188;#058&006253)
According to a 1996 study published in the Journal of Human Resources, Americans of Middle Eastern descent were twice as likely as was the national average to be self-employed.
(A) as was the national average to be self-employed
(B) as the average American to be self-employed
(C) as the national average that they would be self-employed
(D) to be self-employed than was the average American
(E) that they would be self-employed than was the national average
答案:B 这个为什么不把was补出呢?
只有在不补可能存在歧义的时候才补，NATIONAL AVERAGE 前面只有 主系 结构， 一看就是主语跟主语比较， 补出来就显得多余。
其实即使 是S。V。O THAN 结构 也有不补助动词的时候， 判断关键在于有无合理的歧义。
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