高一英语同步班语法讲义

  A. while    B. when    C. as    D. so

9.She worked so quietly _______ no one knew she was there.

  A. which    B. after    C. as    D. that

10. _______ they are twins , they don’t look like the same at all.

  A. Because    B. Though    C. As    D. Since

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