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倒装的一个题目

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7. According to the periodic table, ______ still some elements undiscovered. A. there seem to be B. it seems C. it seems to be D. here seems 答案是a 拜托讲清楚点,感谢
倒装的一个题目
解题思路: 当seem用于there be结构时,其通常的表现形式为There seems to be 。  
解题过程:
正确答案是A 。
句意是:根据周期表可知,似乎仍然有一些元素没有被发现。
There be 句型表示“有...”;
seem to do 似乎做...
当seem用于there be结构时,其通常的表现形式为There seems to be…,如:
  There seems to be something wrong here. 这儿 似乎有点不大对劲。
  There seems to be a mistake in these figures. 这些数字中好像有个错误。
It seems to be...表示“好像,似乎..”,没有存在的意思,所以不符合题意,因此不能选C 。如:
It seems (to be) a good idea. 那似乎是个好主意。
It seems (to be) a real bargain. 这东西似乎很便宜。
最终答案:略