动词不定式的被动
the missing boys were last seen_______near the river a playing b played c play d to play
A 这不是不定式 你应该理解句子的意思:那个丢失的男孩最后一次被看见,是他在和边玩的时候 他是在玩的时候被人看见的,要强调当时的动作--在玩 所以要用进行时.
答案是A
a
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