一、语法填空常考点
1．(2018·北京高考改编)In any unsafe situation, simply (press) the button and a highlytrained agent will get you the help you need.
解析：press 句意：在任何不安全的情况下，只要按一下这个按钮，一个训练有素的代理人就会给你所需要的帮助。此题为“祈使句＋and＋陈述句”结构，所以用动词原形。
2．(2018·天津高考改编)It was only when the car pulled up in front of our house we saw Lily in the passenger seat.
解析：that 句意：直到汽车停在了我们的房子前面的时候，我们才看到莉莉坐在乘客座上。此处是强调句型“It is(was)＋被强调部分＋that＋其他部分”，本句强调的是时间状语从句。
3．(2017·江苏高考改编) (be) it not for the support of the teachers, the student could not overcome her difficulty.
解析：Were 句意：如果没有老师的支持，这名学生不可能克服她的困难。该句是省略if的虚拟条件句，if省略后需要将were提前构成倒装。
