The Environmental Protection Agency frequently puts mandatory controls on toxic substances that present as little risk as one chance in a million that it will cause cancer.
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lkid 2015-10-03 23:24:22
that it重复，前面已经有that present，it指代不清楚，无法指代复数名词toxic substances
katritina 2016-05-07 10:03:37
it 指代不清楚，只能指代risk，但risk cause cancer又不和逻辑
katritina 2016-05-07 10:03:38
it 指代不清楚，只能指代risk，但risk cause cancer又不和逻辑
katritina 2016-05-07 10:03:38
it 指代不清楚，只能指代risk，但risk cause cancer又不和逻辑
ypheroin 2016-01-13 15:31:22
it 指代不清楚，只能指代risk，但risk cause cancer又不和逻辑
moneysharon 2015-08-10 08:46:25
that不需要
chertung 2015-01-06 16:38:51
that 前面没有先行词
