________energy, we turn off the lights for Earth Hour on the last Saturday in March
A．SavingB．To saveC．SavedD．Having saved
B

試題分析：考查非謂語動詞。題意：為節(jié)約能源，我們每年三月最后一個星期六關(guān)燈一小時(shí)。目的狀語由不定式充當(dāng)。故B項(xiàng)正確。
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