2. 专升本
  3. According to the periodic table, ______still some elements undiscovered.

According to the periodic table, ______still some elements undiscovered.

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问题 According to the periodic table, ______still some elements undiscovered.
选项 A、there seem to be
B、it seems to be
C、it seems that
D、there seem
答案A
解析 句意：根据周期表可知，有些元素仍然未被发现。本题考查there be句型的变化。There be结构中的谓语动词可以是“be going to／seem to／happen to…+be (原形)。”故本题选A。若选B、C，句子成分不完整。
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