the officer gave orders that the work __ before sunset

题目

the officer gave orders that the work __ before sunset
A.be finished B will finish
c must be finished Dwould be finished
为什么不选C

答案

选A
ordres + that 从句 （ should ）do ,其中should 可以省略,后面用动词原型.
句中就是省略了should 用的be动词原型