1. I won*t take part in the party _____ Joe invites me.A. if B. when C. unless D. because 2. He didn*t tell me anything _____ he left.A. until B. before C. after D. since 1C unless意为"除非"。2B before在„„之前"。
3. - Why are you late for school?- _____ I got up late.A. Because B. ForC. Since D. As 4. He saw _____ beautiful flowers that he picked them up.A. so B. such C. too D. very 3.A 4.B 更多从属连词的练习可关注http://www.***.com/