He failed in the exam not only his laziness but also he didn’t lis
题型：不详难度：来源：
He failed in the exam not only his laziness but also he didn’t listen to the teacher.| A．because; for | B．because of; because | | C．as; for | D．for; since |
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答案
| B |
解析
| 本题考查考查because, because of, as, since 辨析。分析空后的句子成分，依据句意可知，应选B项。because 是连词，引导原因状语从句，而because of 是复合介词，后面接名词或者代词等。because/as/since/for because表示直接原因，语气最强。回答why提出的问题只能用because。在强调句型中，也只能用because。 as用于解释做某事的原因，语气较弱，通常位于主句前。 since表示的原因是指人们已知的事实，常意为“既然”。语气比because弱，但比as强。通常位于主句前，并常与as换用。 for并列连词，连接并列分句，表示一种补充说明，是推测或判断的理由，语气较弱，不可位于主句前。有时可表示直接原因，相当于because。 |
举一反三
_________you have expressed your fierce determination to get it right, you should act immediately. | A．Even though | B．Ever since | C．Now that | D．As though |
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The process of producing electricity may also give out CO2, ______ you heat your house with electricity instead of charcoal.| A．as long as | B．as soon as | C．as if | D．even if |
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You will succeed in the end ____ you give up halfway．| A．even if | B．as though | C．as long as | D．unless |
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---- Could I take a few days’ leave, sir?
----- I’m afraid you can’t ___________ the work is being done.| A．until | B．before | C．after | D．as |
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________ there is going to be a policy change ________ of those things is going to change.| A．Unless; few | B．Until; few | C．Unless; none | D．Until; none |
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