应该填does catch
原因：1.every now and then是“是不是,偶尔”的意思,加上转折前的逐句连系动词为is,加上generally（一般）的修饰,表示,该句子是在陈述一个一般事实,而且转折句没有时态变化的标志,故也应用一般现在时.
2.该句意为“小Tom平时都是很健康的,但是时不时的他也会感冒!”而助动词do用在肯定句中的动词前面表示强调,其意思因句意而定,有时是“确实”的意思,用在此处表示“也”.因此填does catch更符合句意.
Little Tom is generally healthy,but every now and then he___
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