He failed in the exam not only        his laziness but also        he didn’t listen to the teacher.


  1. A.
    because; for
  2. B.
    because of; because
  3. C.
    as; for
  4. D.
    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(yīng)選B項(xiàng)。because 是連詞,引導(dǎo)原因狀語(yǔ)從句,而because of 是復(fù)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(yǔ)氣最強(qiáng);卮饂hy提出的問(wèn)題只能用because。在強(qiáng)調(diào)句型中,也只能用because。 as用于解釋做某事的原因,語(yǔ)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(shí),常意為“既然”。語(yǔ)氣比because弱,但比as強(qiáng)。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(bǔ)充說(shuō)明,是推測(cè)或判斷的理由,語(yǔ)氣較弱,不可位于主句前。有時(shí)可表示直接原因,相當(dāng)于because。
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