When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today it is less than one-quarter of that amount.
语法 Sentence Correction-2315
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正确的用户笔记
SuperFreDWWW 2016-10-07 20:39:38
it指代不清，如果要指代4000 drive-ins应当用复数代词，amount不能用于可数的4000 drive-ins
阿菲非飞 2014-10-25 14:52:32
less，amount错，it指代不清
糯米团子QUQ 2016-11-01 19:05:03
it没有指代对象，that amount指代4,000 drive-ins错。
qwertyuo 2016-12-23 13:37:43
it指代不清
安吉拉貓 2016-11-10 00:54:17
it没有指代对象 amount 修饰不可数
纯洁小吹吹吹 2016-04-08 10:02:22
less amount 错
songzy3411 2015-03-14 20:29:17
less
Cherry1115 2014-04-06 13:27:04
amount 修饰不可数
