Using a modal auxiliary: It is necessary that they follow their teacher’s instruction.

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问题 Using a modal auxiliary:
It is necessary that they follow their teacher’s instruction.

选项

答案They must/have to follow their teacher’s instruction.

解析 本题要求使用情态助动词,只需把It is necessary that…结构换成情态助动词must/have to,并置于动词follow前即可。
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