【題目】As is known, only hard leads to happiness.

A. work B. works

C. worked D. working

【答案】D

【解析】考查非謂語。句意：眾所周知，只有努力才能獲得幸福。分析句子可知，本空在句子中做主語，故要用動(dòng)名詞形式，故選D項(xiàng)。

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