13.Unless you have planted something, you won't be able to know the pleasure of watching the thing you have planted_____.
答案解析
解析：
感官动词 watch 后既可接省略to的不定式作宾补,也可接现在分词作宾补,两者在意义上稍有区别:不定式作宾补表示一个完整的动作(已完成);现在分词作宾补表示瞬间的动作(正在进行)。根据句意可知,这里表示正在进行的动作,所以应用现在分词作宾补。故选A
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