Question

– Were you at school when I called you?
– Yes, I ________ in the library.
A. studied                      B. am studying                  C. was studying

Answer 1

C

试题分析：be+动词的ing形式构成现在进行时，were/was+动词的ing形式构成过去进行时，根据问句were及called，句意：我给你打电话的时候你在学校吗？可知答语用过去进行时，句意：我正在图书馆里学习。故选C。