If we _________ the earth, we must take action before it is too late.
A．will save B．a(chǎn)re to save C．a(chǎn)re about to save D．a(chǎn)re saving
B

試題分析：原句意思是，如果我們要拯救地球，那么在太遲之前我們必須采取行動(dòng)。be to do結(jié)構(gòu)，在條件狀語從句中用一般現(xiàn)在時(shí)表示將來，答案為B。
點(diǎn)評(píng)：解答此類題型要根據(jù)前后句的關(guān)系，來判斷時(shí)態(tài)。be to do結(jié)構(gòu)，在條件狀語從句中用一般現(xiàn)在時(shí)表示將來。
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