She pretended______ a book when the teacher came in.

问题描述:

She pretended______ a book when the teacher came in.
A to read B to be reading.

答案是B 有when the teacher came in存在,主句需要用进行时的谓语动词形式.可以用另外一种句型来证明你的句子:She pretended that she was reading a book when the teacher came in.看见了吗:过去进行时(主句) ...