[10-20 18:11:12] 来源：http://www.67xuexi.com 高一英语 阅读：85857次
8.He was riding to school _______ he was hit by a car this morning.
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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