选词填空 the students can help his teacher_____________ experiment a.do an b.to do a c.does an
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解答
选:a.do an
考点:help sb.(to) do sth.帮助某人做某事(to可以省略)
an experiment (experiment是以元音开头的名词,故前面用an,不能用a)
综合以上两点可知,答案选a.do an .
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