20.It is vital that the work _______ in time. A. is done B.

題目：

20.It is vital that the work _______ in time. A. is done B. be done C. are done D. was done 怎麼做

解答：

B
我前面填寫了：be finished,道理也講了,就是it is vital後面要用should + 動詞原型的虛擬語氣,這裡換了一個動詞,那就變成be done,舉一反三才能學好英語.