Thelaw requires all cars _______ for safety and

The law requires all cars _______ for safety and efficiency.~

答案是C，require“要求”，后面接宾语从句时，从句的谓语动词用should +动词原形，其中的should 可以省略。小汽车应该是“被检测”，因此应该用(should)be regularly tested.

require用法：
1.It requires that ...
有...的必要

2.require sth. of sb.
对某人有...的要求

3.require sb. to do sth.
要求某人做某事

所以这里选B ，是第三种情况。

希望能帮助到你~
如果你满意~请选择为“满意答案”~谢谢支持哈~

这里用到一个固定结构
require sb/st to do sth.
requires all cars to be tested, 要求所有的车辆报检。所以选择B
如果选择C的话，破坏了require的结构。
假设是从句，即require that 那也要表达为 all cars should be reguarly tested, 这个情态动词should不可省略，因此C是错的。
补充：require的常用法有两种：
A. Require sb./sth. to do sth. （不定式用作被动）需要某人做某事
B. require doing (require主动表被动含义)：
如A require making known to B. A需要被B知道

答案是C，require“要求”，后面接宾语从句时，从句的谓语动词用should
+动词原形，其中的should
可以省略。小汽车应该是“被检测”，因此应该用(should)be
regularly
tested.

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