2013届高考英语一轮复习综合训练集北师大版选修七unit21 human biology
ⅰ.单项填空(建议用时8′) 1.so sudden________that the enemy had no time to escape. a.did the attack b.the attack did c.was the attack d.the attack was 2.she had despaired of ever________alive. a.rescuing b.being rescued
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