问题补充：
The manager considers it is important that everything by weekend.
A. will complete;
B. has completed
C. be completed
D. is completed
答案：
A. will complete;
B. has completed
(答案→)C. be completed
D. is completed
解析：句意：经理认为一切要在周末之前完成很重要。这里使用了固定句型：It is +adj+that从句，从句的谓语使用虚拟语气，谓语是should do，should可以省略，另外everything和complete是被动关系，所以选C。
