What ________you _______(do) at ten o'clock yesterday?I ____________(study) in class.

问题描述:

What ________you _______(do) at ten o'clock yesterday?I ____________(study) in class.

did do studied

What did you do (do) at ten o'clock yesterday? I studied (study) in class.

were doing was studying

What __were__you __doing__(do) at ten o'clock yesterday? I _was studying________(study) in class.

did do,studied