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用英语适当形式填空1.By the time we get to their house,they (finish)su

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用英语适当形式填空
1.By the time we get to their house,they (finish)supper.
2.Children naturally often want the toys (advertise)during TV programs.
3.All the food that (keep) our bodies strong,was once in the vegetable form.
had finished 2 being advertised 3 can keep
请分析具体语法 说得越详细越好
用英语适当形式填空1.By the time we get to their house,they (finish)su
1.had finished
By the time .
到...时为止,要用完成时,而所到的这个时间又在过去,所以要用过去完成时
2.being advertised
这句话的意思是“孩子们在看电视时很自然地想要当时正在广告中宣传的玩具”.正在,要用进行时,toys只能被advertise,过去分词,所以是being advertised
3.can keep
所有能使我们身体保持强壮的食品都曾经以植物形态存在过.
其实这个用keeps也未尝不可.