the teacher entering the classroom, the boy pretended the text.
A. To see ; to read
B. Seen; reading
C. Seeing; to be reading
D. Seeing; to have read
网友回答
A. To see ; to read
B. Seen; reading
(答案→)C. Seeing; to be reading
D. Seeing; to have read
解析：see和其逻辑主语之间是主动关系，故用现在分词作时间状语；pretend后可跟不定式的三种形式：to do (一般式)，to be doing(进行式)，to have done（完成式），分别表示现在、进行和完成的动作，这里表示进行，故用to be reading 。