问几道英语问题I can't use your pen,_____there is no ink in itA.for

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问几道英语问题
I can't use your pen,_____there is no ink in it
A.for B.since C.until D.unless
问一下这里用because和for有什么区别?because和for前面竜加逗号吗?
打错了，D答案应该是because

for 并列连词 conj. "因为" 表原因是补充说明的作用,一般放在句子的后面,中间一般有逗号隔开.for引导的从句也可以放在括号里,但一般不放在句子的开头.
例如：
He is punished, for he is late today.
他受了处罚因为今天他迟到了.
I am thirsty, for the sun is hot.
我由于天热而口渴.
I missed the beginning of the play,for I was late.
我没有看到话剧的开头部分,因为我迟到了.
because 从属连词 conj. "因为", 表示直接原因.比for 语气强烈,可置于句首也可放在句中,放句中时一般不用逗号隔开.而且对于以why开头的问句,一般只能用because引导的从句来回答.
Because he is late today, he is punished.
他受了处罚因为今天他迟到了.
或
He is punished because he is late today.
他受了处罚因为今天他迟到了.
I am hungry because I did not eat breakfast.
我饿了,因为我没有吃早饭.
Because it was getting dark, we walked faster.
因为天色渐渐黑下来了,我们加快了脚步.

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