If we _________ the earth, we must take ...

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。

考点分析：

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