题目内容

She didn't go to the party last night, ______ she had to finish her term paper.
A．ifB．thoughC．tillD．because
D
  本题考查对主从句逻辑关系的理解。主句说她没有参加昨晚的晚会，从刨说她要完成学期论文，显然是解释她不能参加昨晚的晚会的原因，因此应该选表示原因的because。
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