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ron大神说过and确实是表示连接的是两件independent & separate things,但如果想要表示两件事之间的关系,比如因果等,有两种方式:一是用“comma + VERBing”, 二是在and之后加adverb,比如Thus/So/Therefore/As a result/Consequently/Resultantly 。D就是用了第二种方式来communicate relationship.
在LONGMAN上查了一下thus的用法,分享一下好了:
(adverb)
1. as a result of somethings that you have just mentioned.
e.g.: Most of the evidence was destroyed in the fire. Thus it would be almost impossible to prove him guilty.
2. in this manner or way
e.g.: They diluted the drug, thus reducing its effectiveness.
My thoughts as follows:
A: “thus” functions as subject of the sentence "thus is best studied as part of the field animal cognition". It is wrong since "thus" is adverb. If "thus" here doesn't function as subject, then it is not a complete sentence, lacking subject. So, D use "and" to connect two parts and let "the type of behavior..." be the subject of the latter part.
C: "thus" functions as "adverb", and it cannot be used to connect two sentences.
B/E: I think we don't need "to be" here, but I can't tell why.![](static/image/smiley/default/sad.gif)
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