问题

Calculations, which are astronomically exact, have been madewith the use of computers.

A:possible
B:it possible
C:alculations,possibly
D:to be possible

正确答案是：

同类题型

n chbe anybody, for you can’t see him _________.

ose you are unwilling to change your idea,_____

Let’s clean the classroom, ________?

He ___ at the enemy, without saying a word.

下列各句中，没有语病的一句是（）