Watch sb. do是说看到某种动作,而watch sb. doing是说看到做某事的过程. 这句话里用showing最恰当因为"show(ing) us how to do it"是一个过程而不是某个动作.
用and是要动词前后一致,除了前面用不定式的情况.例如这句话要填watched,但如果这句话被改为"we were required (to sit) around and (watch)."就要用原型而不是"to watch".
we sat around and ＿＿(watch) the teacher ＿＿(show) us how to d
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