题目内容
The director wants to make sure no one will solve the mystery until it ________ at the end of the horror film.
| A．is explained | B．will be explained | C．explains | D．has explained |
A
解析试题分析：句意：导演想确保在这部恐怖片的末尾揭示真相之前没有人能够破解这个谜团。Until引导的时间状语从句用一般现在时来表达将来时，it和explain存在着逻辑上的动宾关系；所以用被动结构；故选A。
考点：考查时态和语态。
天天练口算系列答案—Anna doesn’t _______ a black skirt.
—But she ________ a red one.
| A．have; have | B．has; have | C．have; has | D．has; has |
Thanks to our school program The same song , we ___________ about ten songs by the end of last month.
| A．had learned | B．have learned | C．learned | D．were learning |
My school life _________in the past few years.
| A．has changed | B．changed | C．have been changes | D．is changing |
— You seem familiar with Mr. John?
—Of course, we _________ together for three years in the 1990s.
| A．have worked | B．were working | C．are working | D．worked |
Beijing ________ a lot over the years. Now it has become one of the biggest
______ in the world.
| A．changes; cities | B．changed; city |
| C．has changed; cities | D．changed; cities |
Miss Lin ______ a lot of work for the poor area for about 10 years.
| A．does | B．did | C．has done | D．will do |
---How did the accident happen?
---You know, it ________difficult to see the road clearly because it_________.
| A．was; was raining | B．is; has rained |
| C．is; is raining | D．will be; will rain |