—Why was he late? 

—_____ he got up late.


  1. A.
    Since
  2. B.
    Because
  3. C.
    As
  4. D.
    For
B
for ,because,as,since這四個詞作為連詞，都有"因為"的意思，但它們在用法上有區(qū)別： because 是從屬連詞，接表示直接原因的從句，一般放在主句的后面，也可放在主句前面，它表示的語氣最強，在回答why的問句時，必須用because。as 是從屬連詞，說明一般的因果關(guān)系，語氣比because弱，說明比較明顯的原因，它引導的從句通常放在句首，有時也可放在句末。since 意為"既然"，表示對方已知的無需加以說明的原因或事實，語氣比because弱，但是比as 強。for 是并列連詞，用來附帶解釋說明前一分句的原因或理由，for引導的并列句，一般放在所要說明的句子的后面。故選B。
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