Some people believe that they would be better off     more adaptive activities in their leisure time, such as establishing relationships and teaching their children．
A．doingB．to doC．having doneD．to be doing
A

這里考查的是現(xiàn)在分詞做條件狀語的用法，句意是：一些人相信他們會更幸福的，如果在空閑時間多做些適應(yīng)性活動，如建立關(guān)系，和教育孩子。選A。
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