1 . 他们一定是在森林里迷路的孩子；否则，他们就会按计划去湖边露营了。
They________________ the children lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
They
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2 . 她断定他准是把包落在火车上了。
She reasoned that she________________ on the train.
She reasoned that she
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3 . 我的姐姐回家时满脸笑容。她一定通过驾照考试了。(情态动词 + have done)
My sister came home with a broad smile on her face. She____________________________ .
My sister came home with a broad smile on her face. She
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2023-09-12更新
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24次组卷
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2卷引用：Unit 6 The Media Lesson 2 课后练-2022-2023学年高中英语北师大版（2019）选择性必修第二册
4 . 我们一定是走错路了，因为道路变窄了。(must have done)
________ , because the road became narrow.
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5 . 既然没有人帮助他, 他一定是独自完成了这项研究。(must have done)
Since nobody gave him any help, he________ .
Since nobody gave him any help, he
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6 . 这座古堡一定在火灾中被烧毁了，因为我们在它原来所在的地方看到的只有灰烬。
The ancient castle________ ________ ________ ________ ________ in the fire, for we saw nothing but ashes where it used to be. (burn)
The ancient castle
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2022-01-10更新
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31次组卷
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2卷引用：外研2019选择性必修四 unit6 using language 随堂练习
