并说明原因when the teacher came into the classroom ,the students stopped talking and laughing and pretended______ their lessons.A to do B doing C to doing D to be doing

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并说明原因when the teacher came into the classroom ,the students stopped talking and laughing and pretended______ their lessons.A to do B doing C to doing D to be doing
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并说明原因when the teacher came into the classroom ,the students stopped talking and laughing and pretended______ their lessons.A to do B doing C to doing D to be doing
并说明原因
when the teacher came into the classroom ,the students stopped talking and laughing and pretended______ their lessons.
A to do B doing C to doing D to be doing

并说明原因when the teacher came into the classroom ,the students stopped talking and laughing and pretended______ their lessons.A to do B doing C to doing D to be doing
选D
pretend后只接to do,所以,排除BC,又因为这是一个瞬时场景,强调正在,故,用be doing.

C pretend to doing sth. 是假装正在做某事的意思。

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