高一英语填空

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查看11 | 回复2 | 2010-12-12 14:34:58 | 显示全部楼层 |阅读模式
Will the lecture be held at 4 o'clock this afternoon?
---No,it ______________(put off)till tomorrow afternoon.
Since the cause of this disease____________(discover),now we need to develop the medicine to treat it.

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千问 | 2010-12-12 14:34:58 | 显示全部楼层
has been put offhas been discovered原因不太清楚 凭语感
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千问 | 2010-12-12 14:34:58 | 显示全部楼层
will be put off has been discovered
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