— Could you tell me now Mary? — A magazine about science.A. what are you readingB. what y

问题补充：

— Could you tell me now, Mary?

— A magazine about science.

A. what are you reading

B. what you are reading

C. what were you reading

D. what you were reading

答案：

A. what are you reading

(答案→)B. what you are reading

C. what were you reading

D. what you were reading

解析：考查情景交际和宾语从句。“玛丽，现在能告诉我......吗？”“一本有关科技的杂志。”宾语从句的语序要用陈述句语序，即be动词，助动词do，情态动词can等不能放在主语前。排除A、C；根据now可知，是现在的情况，故排除过去进行时。故选B。