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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; forD．for; since
B
 本題考查考查because, because of, as, since 辨析。分析空后的句子成分，依據(jù)句意可知，應選B項。because 是連詞，引導原因狀語從句，而because of 是復合介詞，后面接名詞或者代詞等。because/as/since/for because表示直接原因，語氣最強�；卮饂hy提出的問題只能用because。在強調句型中，也只能用because。 as用于解釋做某事的原因，語氣較弱，通常位于主句前。 since表示的原因是指人們已知的事實，常意為“既然”。語氣比because弱，但比as強。通常位于主句前，并常與as換用。 for并列連詞，連接并列分句，表示一種補充說明，是推測或判斷的理由，語氣較弱，不可位于主句前。有時可表示直接原因，相當于because。
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