大师作文网Only recently _____to realize the dangers caffeine might bri
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Only recently _____to realize the dangers caffeine might bring to our health .
A.that scientists began B.have scientists begun
C.scientist have begun D.that did scientist begin
正确答案为B,可是D为什么不行?
首先only用于句首，句子要用倒装形式，而且是部分倒装。从句中的might用了过去式，由此可以推断出主句要用过去的过去即过去完成时。
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哪来的过去完成时
A.that scientists began B.have scientists begun
C.scientist have begun D.that did scientist begin
正确答案为B,可是D为什么不行?
首先only用于句首，句子要用倒装形式，而且是部分倒装。从句中的might用了过去式，由此可以推断出主句要用过去的过去即过去完成时。
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哪来的过去完成时
你认为caffeine might bring to our health 是发生在realize之后吗?
这是逻辑的错误,
咖啡因对我们身体有好处是比我们发现还要早,我们发现是在他对我们有好处之后才出现的..所以不需要..
这是逻辑的错误,
咖啡因对我们身体有好处是比我们发现还要早,我们发现是在他对我们有好处之后才出现的..所以不需要..
Only recently _____to realize the dangers caffeine might bri
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