题目内容
If we _________ the earth, we must take action before it is too late.
| A．will save | B．are to save | C．are about to save | D．are saving |
B
解析试题分析：原句意思是，如果我们要拯救地球，那么在太迟之前我们必须采取行动。be to do结构，在条件状语从句中用一般现在时表示将来，答案为B。
考点：本题重点考查句子的时态。
点评：解答此类题型要根据前后句的关系，来判断时态。be to do结构，在条件状语从句中用一般现在时表示将来。
练习册系列答案
同步练习强化拓展系列答案
相关题目
He promised me if we_______ the game, he ________us a round of drink.
| A．win; will buy | B．would win; would buy |
| C．won; bought | D．won; would buy |
If we _________ the earth, we must take action before it is too late.
|
A．will save |
B．are to save |
C．are about to save |
D．are saving |