来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/21 10:57:21
3个用所给词的适当形式填空
Scientists will be able to develop space shuttles that _____ (be) big enough to carry large numbers of people to Mars.
Sorry,I ___ (not know) you were here.
Let's make a fire ____ (warm) ourselves up.
1.are
2.didn't know
3.to warm
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