Whenever a chemical change , there is a new substance formed. [ ] A．takes placeB
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Whenever a chemical change ________, there is a new substance formed.
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A．takes placeB．takes a placeC．takes the placeD．took place
试题答案
答案：A
提示：该题考查短语动词和时态.take place表示“发生”是一短语动词，该句用来说明一物理现象，应用一般现在时态，由主句的一般现在时态，可以确定从句也应用一般现在时态.句意为：每当发生化学变化，就有一种新的物质生成. |