1.D 2.B
1.has 前面的主语必须是单数,A,C（C中离has最近的主语是复数）可以排除.第二个句子的主语是they,说明去长城的人不止一个,B可以排除.D中只有Bill是主语,所以可以用has.
2.A：一些时间 B：有时 C：未来某时刻 D：准时 根据意思,可以选择的B
1._______has gone to the Great Wall .They won't come until n
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