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______ you have got an MA degree,you are qualified for a PhD

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______ you have got an MA degree,you are qualified for a PhD program.
A.Though B.Because C.Since D.While
讲解下为什么不能选B
______ you have got an MA degree,you are qualified for a PhD
ecause是从属连词,接表示直接原因的从句,一般放在主句的后面,也可放在主句前面,它表示的语气最强,在回答why的问句时,必须用because.
实际上,不是因为有MA degree,就一定是qualified的.因此,说话者是根据一般事实作出的推断,用since自然更好.
例如:The swimming pool won't be open today because they're making repairs.
游泳池今天不开放,因为他们在修理.
Why did you move to France?
你们为什么搬到法国?
Because my father found work in Paris.
因为我父亲在巴黎找到了工作.
注意:在英语中用了because后,不可再用so.
since 意为"既然",表示对方已知的无需加以说明的原因或事实,语气比because弱,但是比as 强.
例如:Since we have no money,we can't buy that vase.
既然我们没钱,我们就不能买那花瓶.
Since everybody is here,let's begin our party.
既然大家都到了,那就开始我们的聚会吧!