题目内容
We will have no water to drink _________ we don’t protect the earth.
A. until B. if C. unless
B
解析试题分析：A. until直到，B. if如果，C. unless除非，句意：如果我们不保护地球，我们将没有水喝。if引导的条件状语从句用一般现在时，主句用一般将来时。故选B。
考点：考查条件状语从句的用法。
_____________ is necessary __________ he trains himself before the Guangzhou Marathon.
| A．This, 不填 | B．The, 不填 | C．It, that | D．This, that |
—Excuse me, Mum. When can we have dinner?
—Not until it in half an hour.
| A．is prepared | B．has been prepared |
| C．will be prepared | D．was prepared |
If we don’t save energy, it _____ some day.
| A．will be run out | B．has been run out |
| C．will run out | D．has run out |
-- Hello, this is Jack. May I speak to Tom?
-- Sorry, he isn’t in at the moment. If he _______ back, I’ll ask him to call you back.
| A．come | B．comes |
| C．have come | D．came |
—I don’t know if she________to the party. If she________ she’ll call me.
| A．will go, will go | B．will go, goes | C．goes, will go | D．goes, goes |
----How do you like your school life?
----Great. I will never forget the people______helped me,
| A．who | B．which | C．that | D．what |
A graduation ceremony is a custom takes place students graduate from a school.
| A．which; when | B．that; who | C．which; whose | D．that; which |