9．______ smiling and one day life will get tired of upsetting you．（　　）
A．To keepB．KeepingC．KeepD．Having kept

分析 保持微笑（樂(lè)觀），總有一天生活會(huì)不再讓你傷心．

解答 答案：C 題干中and是并列連詞，后面是一個(gè)陳述句，前面也應(yīng)該是一個(gè)句子．選項(xiàng)中只有動(dòng)詞原形能構(gòu)成祈使句，故選C．

點(diǎn)評(píng) 祈使句是用來(lái)表達(dá)建議，命令或要求，通常用動(dòng)詞原形開頭．祈使句加and/or再加陳述句是一種常用結(jié)構(gòu)，表示做什么就會(huì)怎樣或做什么否則就怎樣．

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