It is necessary that the students ____ more excercises to do.
A
【句意】学生们有必要做更多的练习。
【难点】虚拟语气可以用于主语从句中，常用的句型为：It+is(was)+形容词that…，主语从句中的谓语用(should)+v.的表达形式。
It’s important_____ a foreign language
It is necessary that the students ____ more excercises to do.
Many artists predict that this brilliant young actor __ to be a shinning star.
As the pressure____, the liquid rock is forced up through channels in the resistant rock to the earth’s surface.