Ifor an English test when she came in at this time of yesterday.A. studiedB. am studyingC.

问题补充：

Ifor an English test when she came in at this time of yesterday.

A. studied

B. am studying

C. was studying

D. study

答案：

A. studied

B. am studying

(答案→)C. was studying

D. study

解析：句意：昨天这个时间，当她进来的时候，我正在为英语考试而学习。昨天的同一时间进行的动作，用过去进行时，用be的过去式was或were，故选C