B
since侧重主句,从句表示显然的或已为人所知的理由,常译为“因为”、“既然”,语气比because稍弱,通常置于句首,表示一种含有勉强语气的原因
for用作连词时,与because相似,但它所表示的原因往往提供上文未交待过的情况.for不表示直接原因,表明附加或推断的理由
具体你可以看看这里的 几个"因为"比较一下 以后会更清楚
_____ you are overweight,you'd better go on a diet and do mo
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