1A a total of+名词短语 表示一个总量
2C 强调句基本句型：It's +被强调部分+that/who 从句,引导词只有这两种
3A 先排除B,因为be动词后加形容词；sure的主语一般是人,certain一般有it做形式主语,It's certain that...是固定句型
4was 陈述过去发生的客观事实用过去时态.
With a(an) ( ) of 20 students to help,we can finish the work
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